Prosecution Insights
Last updated: April 19, 2026
Application No. 18/930,716

Light Emitting Diode Precision Approach Path Indicator

Non-Final OA §103
Filed
Oct 29, 2024
Examiner
ADNAN, MUHAMMAD
Art Unit
2688
Tech Center
2600 — Communications
Assignee
Hughey & Phillips LLC
OA Round
1 (Non-Final)
68%
Grant Probability
Favorable
1-2
OA Rounds
2y 8m
To Grant
97%
With Interview

Examiner Intelligence

Grants 68% — above average
68%
Career Allow Rate
374 granted / 552 resolved
+5.8% vs TC avg
Strong +29% interview lift
Without
With
+29.2%
Interview Lift
resolved cases with interview
Typical timeline
2y 8m
Avg Prosecution
25 currently pending
Career history
577
Total Applications
across all art units

Statute-Specific Performance

§101
4.3%
-35.7% vs TC avg
§103
64.2%
+24.2% vs TC avg
§102
11.6%
-28.4% vs TC avg
§112
13.8%
-26.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 552 resolved cases

Office Action

§103
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Claim Status Claims 1-20 are pending for examination in this Office action. Claim Rejections - 35 USC § 103 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. The factual inquiries set forth in Graham v. John Deere Co., 383 U.S. 1, 148 USPQ 459 (1966), that are applied for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claims 1, 2 and 10 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker (Walker; US 20120223255) in view of Kachru et al. (Kachru; US 20040207923) and further in view of Schimke et al. (Schimke; US 2022/0404008). As per claim 1, Walker teaches a system, comprising: a heatsink assembly (a heatsink [assembly]; see e.g. para. [0055]); and a plurality of optical channels (a plurality of optical channels comprising LEDs 366, 367, lens 362 and so forth; see e.g. FIGS. 4, 5, and para. [0061-62]), wherein each optical channel of the plurality of optical channels comprises: a light emitting diode (LED) source (LED 366, see e.g. FIG. 5 and para. [0062-63]) coupled to a first surface of the heatsink assembly (a heat sink 364 is mounted behind PCB 361, see e.g. para. [0055], which means at least one surface of the heatsink is coupled to the PCB which is coupled to the LED 366 as shown in the figure 5); a back collimating lens (collimating lens 362, see e.g. FIG. 5 and para. [0055]), wherein the LED source is configured to emit light through the back collimating lens to provide collimated light (the outputted light from LED through the collimating lens 362 is collimated light); an optical filter disposed to interact with a first portion of the collimated light to form filtered light (in addition, walker suggests that the light can be passed through a filter, see e.g. para. [0012], similarly it would have been obvious to a skilled person to include a filter for intended light filtration. Nonetheless, the disclosed waveguides 37, see e.g. FIG. 5 and para. [0061], can be interpreted as filters since the guides filters out any stray light). Walker does not explicitly teach the claimed a front collimating lens configured to interact with the filtered light and a second portion of the collimated light to form output light. Kachru, in a same or similar field of optics, teaches a front collimating lens (a second collimating lens 218, see e.g. FIG. 3) configured to interact with filtered light (the light passing through the second collimating lens interacts with light which goes thought filtered stack 217, see e.g. FIG. 3 and para. [0021]) and a second portion of the collimated light to form output light (the second collimating lens interacts with the first and second portion [light paths 222, 224] of the collimated light which is coming from the first collimating lens 214). Walker and Kachru are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of reduced optical distortion. Walker and Kachru do not explicitly teach that the back collimating lens coupled to a second surface of the heatsink assembly. Schimke, however, teaches a lens coupled to a surface of a heatsink assembly (a lens 206 to contact and/or form a sealing interface with heatsink [assembly] 210; see e.g. para. [0050]). Similarly, it would have been obvious to a person having ordinary skill in the art that the disclosed back collimating lens is coupled or in contact with one or the surfaces of a heatsink as suggested by Schimke. Walker, Kachru and Schimke are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of heat dissipation from one or more components as suggested by Schimke (see e.g. para. [0051]). As per claim 2, the system of claim 1 as taught by Walker, Kachru and Schimke, wherein the heatsink assembly comprises: a plurality of cooling fins along the first surface (heatsink with associated fins or fans; see e.g. para. [0055] of Walker); and a plurality of optical mounts, each optical mount corresponding to respective optical channels of the plurality of optical channels (one or more mounts for the mounting assemble for mounting the heatsink behind the PCB 361, see e.g. para. [0055] of Walker, wherein the mounts need openings for the disclosed PCB and the disclosed LEDs 366; see e.g. FIG. 4). As per claim 10, the system of claim 1 as taught by Walker, Kachru and Schimke, wherein the optical filter corresponding to each optical channel is arranged so as to cover different amounts of respective top portions of the collimated light (the waveguides are associated with different light sources, see e.g. FIG. 5, so they will cover different top potions of the respective outputted and collimated light). Claims 4 and 6 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Sharma et al. (Sharma; US 2024/0391316). As per claim 4, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein at least one back collimating lens comprises a plano-convex lens or a Fresnel lens. Sharma teaches that at least one lens comprises a plano-convex lens or a Fresnel lens (one or more plano-convex lenses; see e.g. para. [0054]). It would been obvious to a person having ordinary skill in the art that the one or more disclosed lenses of Walker can be plano-convex lenses. Walker, Kachru, Schimke and Sharma are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of reduced optical distortion. As per claim 6, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein at least one front collimating lens comprises a plano-convex lens or a Fresnel lens. Sharma teaches that at least one lens comprises a plano-convex lens or a Fresnel lens (one or more plano-convex lenses; see e.g. para. [0054]). It would been obvious to a person having ordinary skill in the art that the one or more disclosed lenses of Walker can be plano-convex lenses. Walker, Kachru, Schimke and Sharma are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of reduced optical distortion. Claims 3 and 5 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Schenck et al. (Schenck; US 2015/0131057). As per claim 3, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein at least one back collimating lens comprises a double convex lens. Schenck, however, teaches at least one collimating lens comprises a double convex lens (at least double convex collimating lens 28 to project light; see e.g. para. [0028]). Walker, Kachru, Schimke and Schenck are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of reduced optical distortion. As per claim 5, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein at least one front collimating lens comprises a double convex lens. Schenck, however, teaches at least one collimating lens comprises a double convex lens (at least double convex collimating lens 28 to project light; see e.g. para. [0028]). Walker, Kachru, Schimke and Schenck are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of reduced optical distortion. Claim 7 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Tiean et al. (Tien; US 2010/0123398). As per claim 7, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein the optical filter comprises a red filter. Tian, however, teaches an optical filter comprises a red filter (a red light filter coating for a projection surface; see e.g. para. [0025-26]). Walker, Kachru, Schimke and Tian are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of providing guidance using different colors as suggested by Tian (see e.g. para. [0023]). Claim 8 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Kawakami et al. (Kawakami; US 2021/0119126). As per claim 8, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein the optical filter provides a chromaticity wherein a Y Chromaticity Coordinate value does not exceed 0.320. Kawakami, however, teaches the optical filter provides a chromaticity wherein a Y Chromaticity Coordinate value does not exceed 0.320 (see e.g. para. [0304]). Similarly, it would have been obvious to a person having ordinary skill in the art to use the teachings and/or specification of Kawakami for light output in desired configuration Walker, Kachru, Schimke and Kawakami are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of providing guidance with desired configuration. Claim 9 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Kishimoto (Kishimoto; US 2011/0063115). As per claim 9, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein the optical filter comprises a flat optical filter. Kishimoto, however, teaches an optical filter 17 may have a flat board shape or a lens shape (see e.g. para. [0123]). Walker, Kachru, Schimke and Kishmoto are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of to allow passage of the light emitted by the internal LEDs and to prevent the passage of light from another outside source. Claims 11 and 12 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Arik et al. (Arik; US 2024/0167664). As per claim 11, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein the LED source comprises a multifaceted reflector. Arik, however, teaches an LED source comprising a multifaceted reflector (see e.g. para. [0005]). Walker, Kachru, Schimke and Arik are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of improved beam control. As per claim 12, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein the LED source comprises a MR16 housing. Arik, however, teaches an LED source comprising MR16 housing (see e.g. para. [0005]). Walker, Kachru, Schimke and Arik are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of improved beam control. Claim 13 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Kremesec et al. (Kremesec; 20240260499). As per claim 13, the system of claim 1 as taught by Walker, Kachru and Schimke, except the claimed wherein the LED source is configured to provide 3000-5000K temperature. Kremesec, however, teaches an LED source is configured to provide 3000-5000K temperature (see e.g. para. [0057]). Walker, Kachru, Schimke and Kremesec are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of improved user control in various ranges. Claims 14-16 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Wang et al. (Wang; US 2008/0007430). As per claim 14, the system of claim 1 as taught by Walker, Kachru and Schimke, even though Walker teaches a distinct transition between the red and white sectors (see e.g. para. [0019]), Walker does not explicitly show that output light comprises a transition line defining a transition between white light corresponding to the second portion of the collimated light and red light corresponding to the filtered light. Wang, however, teaches that output light comprises a transition line defining a transition between white light corresponding to the second portion of the collimated light and red light (outputted light has a transition region or line, see e.g. para. [0012] and FIG. 4, wherein the outputted light red and white [collimated] light; see e.g. para. [0026] and [0028]) corresponding to the filtered light (the outputted light can be filtered as discussed in analysis of merits of claim 1). Walker, Kachru, Schimke and Wang are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of improved system with clear signage for landing. As per claim 15, The system of claim 14 as taught by Walker, Kachru, Schimke and Wang, wherein the transition line is no more than 3 arc minutes in width (see e.g. para. [0028] of Wang). As per claim 16, the system of claim 14 as taught by Walker, Kachru, Schimke and Wang, wherein the transition line is arranged based on a 3.00° nominal glide path of an aerial vehicle (the LED module can be adjusted in a range 2 ͦ-8 ͦ to adapt for different glide slope requirements, see e.g. para. [0028] of Wang, which means a range of glide path angles can be accommodated). Claim 17 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Covelli et al. (Covelli; US 2016/0159446). As per claim 17, The system of claim 1 Walker, Kachru, and Schimke, further comprising: providing input power from at least one of: 120/240V (the unit will be powered by the existing main electricity supply; see e.g. para. [0035] of Walker) or 6.6A constant current regulator (CCR), except the claimed a printed wire assembly (PWA), wherein the PWA is configured to provide the power. Covelli, however, teaches a printed wiring assembly 296 which is connected to a power generation source 298 (see e.g. para. [0142]), wherein it would have been obvious to a person having ordinary skill in the art to include a printed wire assembly in the disclosed system of Walker for the inherent benefit of optimized heat dissipation or reduced cost. Walker, Kachru, Schimke and Covelli are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for reducing heat or manufacturing cost. Claims 18-19 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke and further in view of Altman (Altman; US 2025/0052780). As per claim 18, the system of claim 1 as taught by Walker, Kachru, and Schimke, except where the claimed subject further comprising a tilt sensor, wherein the tilt sensor comprises an accelerometer, wherein the accelerometer is configured to measure a tilt of the system in real time. Altman, however, teaches a tilt sensor, wherein the tilt sensor comprises an accelerometer, wherein the accelerometer is configured to measure a tilt of the system in real time (an accelerometer for measuring tilt and receiving acceleration data, see e.g. para. [0063], wherein the data needs to be determined real-time or constantly otherwise the notification may not be timely generated; see e.g. para. [0005]). Walker, Kachru, Schimke and Altman are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of improved system which timely reports a hazardous situation of tilting. As per claim 19, the system of claim 18 as taught by Walker, Kachru, Schimke and Altman, further comprising a computing device, wherein the computing device is configured to execute program instructions so as to carry out operations as taught by Walker, Kachru, Schimke and Altman, the operations comprising: receiving tilt data from the accelerometer (step 302, FIG. 9 of Altman); determining whether the tilt data indicates an angle greater than a threshold angle (determine if tilt angle is greater than a threshold angle or satisfies a threshold; see e.g. para. [0024-25] of Altman); and in response to the tilt data being greater than the threshold angle, generating a fault indication (generating a notification as discussed earlier, see e.g. para. [0040] of Altman, wherein the notification is a fault indication; see also para. [0033] of Walker). Claim 20 is/are rejected under 35 U.S.C. 103 as being unpatentable over Walker in view of Kachru, Schimke, Altman and further in view of Ertl et al. (Ertl; US 2023/0048445) As per claim 20, the system of claim 19 as taught by Walker, Kachru, Schimke and Altman, except the claimed wherein the operations further comprise: in response to the tilt data being greater than the threshold angle, disabling normal operation of the system. Ertl, however, in response to tilt data being greater than the threshold angle, disabling normal operation of system (see e.g. para. [0012-13]). Walker, Kachru, Schimke and Altman are in a same or similar field of optics, therefore it would have been obvious to a person having ordinary skill in the art before the effective filing date of the claimed invention to combine their teachings for the purpose of avoiding injuries or accidents. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to MUHAMMAD ADNAN whose telephone number is (571)270-3705. The examiner can normally be reached on Monday-Thursday 10AM-6PM. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Steven Lim can be reached on 571-270-1210. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see https://ppair-my.uspto.gov/pair/PrivatePair. Should you have questions on access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /MUHAMMAD ADNAN/Primary Examiner, Art Unit 2688
Read full office action

Prosecution Timeline

Oct 29, 2024
Application Filed
Jan 09, 2026
Non-Final Rejection — §103 (current)

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Prosecution Projections

1-2
Expected OA Rounds
68%
Grant Probability
97%
With Interview (+29.2%)
2y 8m
Median Time to Grant
Low
PTA Risk
Based on 552 resolved cases by this examiner. Grant probability derived from career allow rate.

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