Prosecution Insights
Last updated: April 19, 2026
Application No. 18/558,792

DIALYSIS MACHINE

Non-Final OA §102§103
Filed
Nov 03, 2023
Examiner
DEAK, LESLIE R
Art Unit
3799
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Fresenius Medical Care
OA Round
1 (Non-Final)
75%
Grant Probability
Favorable
1-2
OA Rounds
3y 4m
To Grant
93%
With Interview

Examiner Intelligence

Grants 75% — above average
75%
Career Allow Rate
693 granted / 924 resolved
+5.0% vs TC avg
Strong +18% interview lift
Without
With
+18.0%
Interview Lift
resolved cases with interview
Typical timeline
3y 4m
Avg Prosecution
43 currently pending
Career history
967
Total Applications
across all art units

Statute-Specific Performance

§101
1.8%
-38.2% vs TC avg
§103
47.9%
+7.9% vs TC avg
§102
25.1%
-14.9% vs TC avg
§112
11.4%
-28.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 924 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 . Drawings The drawings are objected to under 37 CFR 1.83(a). The drawings must show every feature of the invention specified in the claims. Therefore, the blood treatment device with a cassette, control unit, and pumps must be shown or the feature(s) canceled from the claim(s). No new matter should be entered. Corrected drawing sheets in compliance with 37 CFR 1.121(d) are required in reply to the Office action to avoid abandonment of the application. Any amended replacement drawing sheet should include all of the figures appearing on the immediate prior version of the sheet, even if only one figure is being amended. The figure or figure number of an amended drawing should not be labeled as “amended.” If a drawing figure is to be canceled, the appropriate figure must be removed from the replacement sheet, and where necessary, the remaining figures must be renumbered and appropriate changes made to the brief description of the several views of the drawings for consistency. Additional replacement sheets may be necessary to show the renumbering of the remaining figures. Each drawing sheet submitted after the filing date of an application must be labeled in the top margin as either “Replacement Sheet” or “New Sheet” pursuant to 37 CFR 1.121(d). If the changes are not accepted by the examiner, the applicant will be notified and informed of any required corrective action in the next Office action. The objection to the drawings will not be held in abeyance. Claim Rejections - 35 USC § 102 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. (a)(2) the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application, as the case may be, names another inventor and was effectively filed before the effective filing date of the claimed invention. Claims 1-6, 9, 11, and 12 are rejected under pre-AIA 35 U.S.C. 102(a)(1) and (a)(2) as being anticipated by US 2015/0335809 to Stuva et al. In the specification and figures, Stuva discloses the apparatus substantially as claimed by Applicant. With regard to claims 1, 2, and 11, Stuva discloses a blood treatment system 310 comprising machine 360 to be used with a disposable cassette 372, wherein the machine has a coupling region (see pump raceways 366), and a control unit 361 that carries out pressure measurements and evaluations at different times to determine the quality of the connection of the cassette to the machine 360 (see FIG 2, ¶0095, 0107, 0113-114). With regard to claims 3, Applicant is setting forth the intended use of the claimed apparatus. It has been held that 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 satisfying the claimed structural limitations. See MPEP § 2114. With regard to claims 4-5, Stuva discloses that the apparatus comprises multiple pumps (such as pump 14) and takes pressure measurements (Ppump) to test the connection between the pump 14 and a valve 90 to measure the decay of a connection to a return line 82 (see ¶0116). With regard to claims 6 and 12, Stuva discloses that the pressure measurement may be carried out prior to pump operation as well as during pump operation (see ¶0108). With regard to claim 9, Stuva discloses that the apparatus is configured to store measured values and display results (see ¶0090-0091, 0071). Claim Rejections - 35 USC § 103 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. Claims 7, 8, are rejected under 35 U.S.C. 103 as being unpatentable over US 2015/0335809 to Stuva et al in view of US 2005/0118030 to Kline et al. In the specification and figures, Stuva discloses the apparatus substantially as claimed by Applicant (see rejections above). With regard to claims 7, 8, and 13-15, Stuva does not disclose pressure measurements for a plurality of pumps and evaluation for coordination or tolerance. However, Kline discloses an extracorporeal blood treatment machine with a cassette and a testing protocol that tests the pressure at multiple pumps and a controller that determines whether the cassette is properly installed based on threshold values and controlled in a coordinated fashion (see Kline ¶0313-0320, 0153-0154). It would have been obvious to a person having ordinary skill in the art to use the wet-test methods on multiple pumps as disclosed by Kline in the apparatus disclosed by Stuva, in order to ensure continuous proper connection between the cassette and the operating pumps, as taught by Kline. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure: US 2019/0209766 Thiebaud et al. Testing proper installation of a cassette in a medical fluid treatment system Any inquiry concerning this communication or earlier communications from the examiner should be directed to LESLIE R DEAK whose telephone number is (571)272-4943. The examiner can normally be reached Monday-Friday, 9am to 5:30pm. 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, Sarah Al-Hashimi can be reached at 571-272-7159. 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. /LESLIE R DEAK/Primary Examiner, Art Unit 3799 12 January 2026
Read full office action

Prosecution Timeline

Nov 03, 2023
Application Filed
Jan 12, 2026
Non-Final Rejection — §102, §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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IMPLANTS WITH CONTROLLED DRUG DELIVERY FEATURES AND METHODS OF USING SAME
2y 5m to grant Granted Apr 14, 2026
Patent 12594186
AQUEOUS HUMOR DRAINAGE DEVICE WITH ADJUSTABLE TUBE DIAMETER
2y 5m to grant Granted Apr 07, 2026
Patent 12575972
GLAUCOMA STENT AND METHODS THEREOF FOR GLAUCOMA TREATMENT
2y 5m to grant Granted Mar 17, 2026
Patent 12569604
METHOD AND DEVICES FOR DETERMINING A TIME POINT FOR MEASURING PRESSURE MEASUREMENTS
2y 5m to grant Granted Mar 10, 2026
Patent 12569654
SYSTEMS AND METHODS FOR TREATMENT OF FLUID OVERLOAD
2y 5m to grant Granted Mar 10, 2026
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
75%
Grant Probability
93%
With Interview (+18.0%)
3y 4m
Median Time to Grant
Low
PTA Risk
Based on 924 resolved cases by this examiner. Grant probability derived from career allow rate.

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