Prosecution Insights
Last updated: October 01, 2026
Application No. 18/904,697

DIAFILTRATION-NANOFILTRATION-REVERSE OSMOSIS FOR BRINE MANAGEMENT

Non-Final OA §102§103
Filed
Oct 02, 2024
Priority
Oct 30, 2023 — SG 10202303057T +1 more
Examiner
MENON, KRISHNAN S
Art Unit
Tech Center
Assignee
Nanyang Technological University
OA Round
1 (Non-Final)
60%
Grant Probability
Moderate
1-2
OA Rounds
1y 3m
Est. Remaining
71%
With Interview

Examiner Intelligence

Grants 60% of resolved cases
60%
Career Allowance Rate
904 granted / 1514 resolved
At TC average
Moderate +12% lift
Without
With
+11.7%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
87 currently pending
Career history
1571
Total Applications
across all art units

Statute-Specific Performance

§101
2.0%
-38.0% vs TC avg
§103
40.9%
+0.9% vs TC avg
§102
23.7%
-16.3% vs TC avg
§112
23.8%
-16.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1514 resolved cases

Office Action

§102 §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 Rejections - 35 USC § 102 and 103 The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. 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. Claim(s) 1-20 are rejected under 35 U.S.C. 102(a1) as anticipated by or, in the alternative, under 35 U.S.C. 103 as obvious over Al-Samadi (US 5,635,071.) The figure in Al-Samadi is copied herein with some annotations, along with applicant’s fig. 16, the closest disclosure for the claims, for comparison. At the outset, claims are for an apparatus. Therefore, any claim limitations directed at the intended use, materials worked upon (the ions, the brine, saline, etc.,) or functional language would not make the claims patentable over the prior art, Al-Samadi. A claim term is functional when it recites a feature "by what it does rather than by what it is" (e.g., as evidenced by its specific structure or specific ingredients). In re Swinehart, 439 F.2d 210, 212, 169 USPQ 226, 229 (CCPA 1971). "[A]pparatus claims cover what a device is, not what a device does." Hewlett-Packard Co. v. Bausch & Lomb Inc., 909 F.2d 1464, 1469, 15 USPQ2d 1525, 1528 (Fed. Cir. 1990) (emphasis in original). A claim containing a "recitation with respect to the manner in which a claimed apparatus is intended to be employed does not differentiate the claimed apparatus from a prior art apparatus" if the prior art apparatus teaches all the structural limitations of the claim. Ex parte Masham, 2 USPQ2d 1647 (Bd. Pat. App. & Inter. 1987) PNG media_image1.png 292 637 media_image1.png Greyscale Al-Samadi’ figure (above) in comparison with applicant’s fig. 16 (below.) PNG media_image2.png 478 775 media_image2.png Greyscale Al-Samadi is configured for diafiltration NF because it has an NF dilution stream, as claimed. Al-Samadi teaches two NF stages in series with respect to the retentate stream, and two RO stages in series, also with respect to the retentate stream, but in reverse direction, and in series in forward direction with respect to the permeate stream. as is seen in the figure. The permeate from the NF stages are fed to the first RO stage. The permeate from the first RO stream is used as a diluent in for the second NF stage. Retentate for first NF stage is fed to the second NF stage. First retentate output comes from the second NF stage, and a second retentate output comes from the RO stages. These anticipate claims 1-5, 8-10 and 19. Claim 20: RO has two stages, feed to RO-I is from NF permeate. However, claim 20 differs from Al-Samadi in having the RO-II retentate being fed to RO-I: i.e., the retentate flow is reversed from that of claim 20. This is considered as a simple reversal or rearrangement of parts or sequence of addition under MPEP 2144.04 and is unpatentable unless otherwise shown. Ex parte Rubin, 128 USPQ 440 (Bd. App. 1959) (Prior art reference disclosing a process of making a laminated sheet wherein a base sheet is first coated with a metallic film and thereafter impregnated with a thermosetting material was held to render prima facie obvious claims directed to a process of making a laminated sheet by reversing the order of the prior art process steps.). See also In re Burhans, 154 F.2d 690, 69 USPQ 330 (CCPA 1946) (selection of any order of performing process steps is prima facie obvious in the absence of new or unexpected results); In re Gibson, 39 F.2d 975, 5 USPQ 230 (CCPA 1930) (Selection of any order of mixing ingredients is prima facie obvious.) In re Gazda, 219 F.2d 449, 104 USPQ 400 (CCPA 1955) (Prior art disclosed a clock fixed to the stationary steering wheel column of an automobile while the gear for winding the clock moves with steering wheel; mere reversal of such movement, so the clock moves with wheel, was held to be an obvious modification.). In re Japikse, 181 F.2d 1019, 86 USPQ 70 (CCPA 1950) (Claims to a hydraulic power press which read on the prior art except with regard to the position of the starting switch were held unpatentable because shifting the position of the starting switch would not have modified the operation of the device.); In re Kuhle, 526 F.2d 553, 188 USPQ 7 (CCPA 1975) (the particular placement of a contact in a conductivity measuring device was held to be an obvious matter of design choice) The ratios in claims 6 and 7 are process-related. Claims 11-18 recite process steps, intended use or material worked upon (like brine and ions.) Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to KRISHNAN S MENON whose telephone number is (571)272-1143. The examiner can normally be reached Flexible, but generally Monday-Friday: 8:00AM-4:30PM. 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, Prem Singh can be reached at 5712720579. 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. /KRISHNAN S MENON/ Primary Examiner, Art Unit 1771
Read full office action

Prosecution Timeline

Oct 02, 2024
Application Filed
Sep 23, 2026
Non-Final Rejection mailed — §102, §103 (current)

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
60%
Grant Probability
71%
With Interview (+11.7%)
3y 3m (~1y 3m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1514 resolved cases by this examiner. Grant probability derived from career allowance rate.

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