Prosecution Insights
Last updated: August 16, 2026
Application No. 18/990,604

ELECTRONIC CARBURETOR INJECTION

Final Rejection §103
Filed
Dec 20, 2024
Priority
Oct 27, 2018 — continuation of 16/172,767
Examiner
STAUBACH, CARL C
Art Unit
3747
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
K&N Engineering Inc.
OA Round
2 (Final)
73%
Grant Probability
Favorable
3-4
OA Rounds
11m
Est. Remaining
94%
With Interview

Examiner Intelligence

Grants 73% — above average
73%
Career Allowance Rate
429 granted / 585 resolved
+3.3% vs TC avg
Strong +21% interview lift
Without
With
+20.6%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
24 currently pending
Career history
603
Total Applications
across all art units

Statute-Specific Performance

§101
3.9%
-36.1% vs TC avg
§103
46.1%
+6.1% vs TC avg
§102
23.4%
-16.6% vs TC avg
§112
24.5%
-15.5% vs TC avg
Black line = Tech Center average estimate • Based on career data from 585 resolved cases

Office Action

§103
aDETAILED 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 . Specification The amendment to the specification is acceptable. Response to Arguments Applicant’s arguments, see pg 6, filed 6/15/26, with respect to 35 USC 112b rejection of claim 2,7,12,13,18 have been fully considered and are persuasive. The 35 USC 112b of claims 2,7,12,13,18 has been withdrawn. Applicant’s arguments, see pgs 6-8, filed 6/15/26, with respect to the rejection(s) of claim(s) 1-11,13-20 under 35 USC 102 and claim 12 under 35 USC 102 have been fully considered and are persuasive. Therefore, the rejection has been withdrawn. However, upon further consideration, a new ground(s) of rejection is made in view of Laws in view of Halsmer and Houston and further in view of Gruden as described below. Further, examiner finds the pending claims to be either identical and or lacking patentable distinction to parent application 16/172,767 appealed claim set with Patent Trial and Appeal Board finding examiner affirmed in full on 4/2/24. Therefore, under res judicata, applicant is precluded from seeking a claim in the instant case, see MPEP 2190, and res judicata rejection below. Res Judicata In Re Claims 1-11,14-20, claims 1-11,14-20 are rejected under the doctrine of res judicata, claims 1-11,14-20 are not patentably distinct from claims that were previously rejected as the rejection was affirmed on appeal and the decision on appeal became final, see decision by Patent Trial and Appeal Board, examiner affirmed mail date 4/2/24. See MPEP 706.07(h), subsection XI, and MPEP 2190, subsection II. See below claim table: 18/990,604 claims 16/172,767 claims 1 “driver” “coupled” “high-pressure fuel” “direct unused fuel back to a fuel tank” 2nd last clause, although reworded non-distinct Last clause, although reworded non-distinct 1,12,13 “end-user” “coupling” “pressurized fuel” “unused fuel is directed back to a fuel tank at a lower pressure” Claim 12 Claim 13 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 14 14 15 15 16 16 17 17 18 18 19 19 20 20 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 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. Claim(s) 1-11,14-20 is/are rejected under 35 U.S.C. 103 as being unpatentable over Laws US 2017/0074226 in view of Halsmer US 2005/0247292 and Houston et al US 2002/0010541 and Gruden et al US 4,258,681. In Re 1-20 Laws teaches: 1. An electronic carburetor injection system (100, fig. 1) for an internal combustion engine (title, abstract), comprising: a fuel injector (36) that delivers liquid fuel in the form of a spray discharge (inherent); a plate (31) that supports the fuel injector between a carburetor (32) and an intake manifold (33) (paras. 45-50); an oxygen sensor (“oxygen sensor” para. 64) disposed within an exhaust system (para. 64) of the engine; and an engine control unit (para. 50 “computer”) configured to operate the fuel injector according to signals received from at least the oxygen sensor (para. 64, figs. 12,16); signal connectors coupled with the engine control unit and configured to be connected to input sensors installed on the engine (paras 51-52); a fuel circuit comprising a fuel pump (para 49 “fuel pump”) that cooperates with a fuel pressure regulator (para 49 “fuel regulator”) to deliver high-pressure fuel to the fuel injector (pumps raise pressure),and a fuel feed block coupled with the fuel injector that cooperates with the fuel pressure regulator and the fuel pump (para 49) to deliver fuel to the fuel injector by way of a fuel inlet port disposed in the fuel feed block (construed as items 30 and 58 see figs 3-4). Laws is silent as to, however, Houston teaches gauges configured to display engine management information to a driver (para 30). Houston further teaches display conveys to the operator information supplied from ECU (para 30). It would have been obvious to a person having ordinary skill in the art at the time of the invention (pre-AIA ) or before the effective filing date of the invention (AIA ) to add Houstons display to Laws in order to convey ECU information to the operator. Laws does not however, Gruden teaches unused fuel is directed back to a fuel (19 fig 1 col 2 ll. 25-35). It would have been obvious to a person having ordinary skill in the art at the time of the invention (pre-AIA ) or before the effective filing date of the invention (AIA ) to add Gruden’s return line to Laws fuel circuit to return excess fuel to the fuel tank. In Re 2-11,14-20 Law further teaches: 2. The system of claim 1, wherein the electronic carburetor injection system is a (taken as Laws system 100) fuel injection system that supplements a fuel/air mixture delivered to the engine by way of the carburetor (abstract, figs. 12-16). 3. The system of claim 1, wherein the electronic carburetor injection system delivers a measured portion of additional fuel to the engine whenever a fuel/air mixture delivered by the carburetor is found to be lacking sufficient fuel to support a desired combustion of the fuel/air mixture within the engine (fig 12 steps 54-57, figs. 13-15 steps 61,62,65,66,69,70). 4. The system of claim 1, wherein coupling the electronic carburetor injection system with the carburetor operates to maintain a fuel/air mixture within a proper range across a multiplicity of driving conditions and changing environmental conditions (para. 66 “following factors”). 5. The system of claim 1, wherein the electronic carburetor injection system may be configured to assist with cold starting the engine by operating for a temporary, predetermined time period following starting the engine (para. 66 “ability to start the engine, performance of the vehicle in cold weather” where Laws operates for a temporary predetermined time period per figs. 12-16). 6. The system of claim 1, wherein the electronic carburetor injection system may be programmed (para. 65 “programmable”) by an end-user to operate whenever a fuel/air mixture delivered by the carburetor is found to be leaner than a specific value (figs. 10-16). 7. The system of claim 1, wherein the plate is a solid member having a uniform thickness that is suitable for being fastened between the carburetor and the intake manifold (figs. 1-4,7-9). 8. The system of claim 1, wherein the plate is comprised of a rigid material that is capable of (claim limitation "capable of" interpreted as an intended result, where the limitations following "capable of" are not given patentable weight. See MPEP 2111.04: "However, the court noted that a "‘whereby clause in a method claim is not given weight when it simply expresses the intended result of a process step positively recited.’" Id. (quoting Minton v. Nat’l Ass’n of Securities Dealers, Inc., 336 F.3d 1373, 1381, 67 USPQ2d 1614, 1620 (Fed. Cir. 2003))."") withstanding being fastened between the carburetor and the intake manifold, as well as tolerating (claim limitation "tolerating" interpreted as an intended result, where the limitations following "tolerating" are not given patentable weight. See MPEP 2111.04: "However, the court noted that a "‘whereby clause in a method claim is not given weight when it simply expresses the intended result of a process step positively recited.’" Id. (quoting Minton v. Nat’l Ass’n of Securities Dealers, Inc., 336 F.3d 1373, 1381, 67 USPQ2d 1614, 1620 (Fed. Cir. 2003))."") engine operating temperatures and contact with liquid fuel (inherent to use and operation of an internal combustion engine). 9. The system of claim 1, wherein the plate includes a central opening that allows a fuel/air mixture delivered by the carburetor to pass through the plate and enter the intake manifold (see fig 1). 10. The system of claim 9, wherein the plate is configured to support the fuel injector in a location that facilitates operating the fuel injector without interfering with normal operation of the carburetor (fig 1, paras. 8-14,46,49). 11. The system of claim 9, wherein the opening includes an injector port that allows the spray discharge to enter the intake manifold (fig 1, paras. 8-14,46,49). 14. The system of claim 1, wherein the oxygen sensor is a wide-band 02 sensor (“oxygen sensor” paras. 51-52,64 wide band construed as ability to measure oxygen in exhaust manifold to control engine) that is suitable (claim limitation "suitable" interpreted as an intended result, where the limitations following "suitable" are not given patentable weight. See MPEP 2111.04: "However, the court noted that a "‘whereby clause in a method claim is not given weight when it simply expresses the intended result of a process step positively recited.’" Id. (quoting Minton v. Nat’l Ass’n of Securities Dealers, Inc., 336 F.3d 1373, 1381, 67 USPQ2d 1614, 1620 (Fed. Cir. 2003))."") for being placed into contact with exhaust gases exiting the internal combustion engine during operation (paras. 51-52,64). 15. The system of claim 1, wherein a sensor cable facilitates sensor data indicating the oxygen content of the exhaust gases being received by the engine control unit (paras. 15-16,50, step 46-47 fig. 11). 16. The system of claim 1, wherein an actuator cable facilitates operation of the fuel injector by way of signals sent by the engine control unit (paras. 15-16,50, step 46-47 fig. 11). 17. The system of claim 1, wherein the engine control unit is configured to control the operation of the fuel injector in cooperation with a fuel/air mixture delivered by the carburetor (figs. 10-16). 18. The system of claim 17, wherein the fuel/air mixture is determined by way of the oxygen sensor in contact with exhaust gases exiting the internal combustion engine during operation (figs. 10-16 fig 12 steps 54-57, figs. 13-15 steps 61,62,65,66,69,70). 19. The system of claim 1, wherein the engine control unit includes a fixed programming that is based upon a particular application of the internal combustion engine (paras. 65-66). 20. The system of claim 1, wherein the engine control unit is configured to be programmable by an end-user (paras. 65-66). Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to CARL C STAUBACH whose telephone number is (571)272-3748. The examiner can normally be reached Monday - Thursday 7:00 AM to 5:00 PM. Interview Agendas can be faxed to examiner at (571)273-3748. 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, Logan Kraft can be reached at 571-270-5065. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /CARL C STAUBACH/Primary Examiner, Art Unit 3747
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Prosecution Timeline

Dec 20, 2024
Application Filed
Feb 17, 2026
Non-Final Rejection mailed — §103
Jun 15, 2026
Response Filed
Jul 23, 2026
Final Rejection mailed — §103 (current)

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Prosecution Projections

3-4
Expected OA Rounds
73%
Grant Probability
94%
With Interview (+20.6%)
2y 7m (~11m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 585 resolved cases by this examiner. Grant probability derived from career allowance rate.

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