Prosecution Insights
Last updated: April 19, 2026
Application No. 18/826,727

Pulsatile Fluid Pump System

Non-Final OA §103
Filed
Sep 06, 2024
Examiner
LETTMAN, BRYAN MATTHEW
Art Unit
3746
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Ventriflo Inc.
OA Round
1 (Non-Final)
65%
Grant Probability
Moderate
1-2
OA Rounds
3y 2m
To Grant
99%
With Interview

Examiner Intelligence

Grants 65% of resolved cases
65%
Career Allow Rate
609 granted / 941 resolved
-5.3% vs TC avg
Strong +52% interview lift
Without
With
+52.5%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
37 currently pending
Career history
978
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
52.9%
+12.9% vs TC avg
§102
21.5%
-18.5% vs TC avg
§112
23.8%
-16.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 941 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 . Specification The specification is objected to as failing to provide proper antecedent basis for the claimed subject matter. See 37 CFR 1.75(d)(1) and MPEP § 608.01(o). Correction of the following is required: The specification as filed does not disclose a channel which prevents rotation of the diaphragm assembly as claimed. The Examiner also notes that accordingly, this recitation will not be afforded the priority date of the parent application since it was not disclosed in the parent application. Claim Objections Claims 1-10 are objected to because of the following informalities: Claim 1 line 16 recites “the linear motor” but line 14 only recites “a motor” and line 17 recites “the motor”. In claim 1 line 14 “a motor” would be clearer if written as --a linear motor--. In claim 1 line 17 “the motor” would be clearer if written as --the linear motor--. In claims 2-10, line 1, “pump assembly” would be clearer if written as --pump system-- as first recited in claim 1. Appropriate correction is required. 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 1-4 are rejected under 35 U.S.C. 103 as being unpatentable over U.S. Patent Publication 2012/0051956 to Grip in view of U. S. Patent Publication 2014/0161644 to Weatherley. Referring to claim 1, Grip teaches a pulsatile fluid pump system comprising: a pump-valving assembly (2) including a chamber (8) and a set of ports (5, 6) (Figures 1 and 2, Fig. 1 annotated below; paragraphs [0029]-[0033]); a diaphragm assembly coupled to the chamber (8) and including an edge-mounted flexible diaphragm (4) (Figures 1 and 2, Fig. 1 annotated below; paragraphs [0029]-[0033]); wherein the diaphragm assembly and the pump-valving assembly (2) are configured as an integral pump assembly (when assembled they are an integral assembly) surrounded by a flange (16) having a pair of opposed sides (right and left sides as shown in Figures) (Figures 1 and 2, Fig. 1 annotated below; paragraphs [0029]-[0033]); a control housing (3) configured to removably and slidably couple to the integral pump assembly (Figures 1 and 2, Fig. 1 annotated below; paragraph [0030] wherein at least portions 16 and 17 are slidably engaged), the control housing (3) including: a channel having a pair of opposed sides (right and left sides as shown in Figures) configured to receive the flange (16) when the control housing (3) is slideably (at least axially slideably) coupled to the integral pump assembly (2) (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated below; paragraphs [0029]-[0033]); a push rod (10, 11, 13) configured to removably and slideably couple to the diaphragm assembly (2) when the control housing (3) is slideably coupled to the integral pump assembly (2) (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated below; paragraphs [0029]-[0033]); a linear motor (20, 15) coupled to the push rod (10, 11, 13) and configured to reciprocate the push rod (10, 11, 13) in an axial direction (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated below; paragraphs [0029]-[0033]); and a controller system electrically coupled to the linear motor and configured to cause a desired operation of the linear motor (20, 15) (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated below; paragraphs [0029]-[0033], wherein in order for the pump to operate as disclosed there must be a control system of some sort “electrically coupled to the linear motor and configured to cause a desired operation of the linear motor” as claimed). [AltContent: textbox (Slot)][AltContent: arrow][AltContent: arrow][AltContent: textbox (Pump Housing)][AltContent: arrow][AltContent: arrow][AltContent: textbox (Right Side of Channel)][AltContent: textbox (Left Side of Channel )][AltContent: arrow][AltContent: arrow][AltContent: textbox (Push Rod)][AltContent: arrow][AltContent: textbox (Head)][AltContent: textbox (Neck)][AltContent: arrow][AltContent: arrow] PNG media_image1.png 566 898 media_image1.png Greyscale Annotation of Grip Figure 1. Grip is silent as to whether or not the disclosed coupling prevents rotation. Weatherley teaches a pump comprising: a control housing (6) configured to removably and slideably couple to an integral pump assembly (4), the control housing (6) including: a channel (16) having a pair of opposed sides configured to receive a flange (10) when the control housing (6) is slideably coupled to the integral pump assembly (4), and to prevent rotation of a diaphragm assembly (60) while the control housing (6) is coupled to the integral pump assembly (4) (Figures 1-8; paragraph [0024]-[0047]). It would have been obvious before the invention was effectively filed, to a person having ordinary skill in the art, to modify the pump system taught by Grip with the connecting flange taught by Weatherley in order to use a coupling that allows for automatic alignment. Weatherley paragraph [0006]. Referring to claim 2, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 1, as detailed above, and Grip further teaches a system wherein: the diaphragm assembly further comprises a coupler (9) having a slot (12) configured to slideably receive a head (11) and an upper portion (10) of the push rod (10, 11, 13) (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated above; paragraphs [0029]-[0033]). Referring to claim 3, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 2, as detailed above, and Grip further teaches a system wherein: the integral pump assembly includes a pump housing having a neck in which the coupler (9) reciprocates (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated above; paragraphs [0029]-[0033]). Referring to claim 4, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 3, as detailed above, and Grip further teaches a system wherein: the neck configured to maintain axial and rotational alignment of the coupler (9) (Figures 1 and 2, Fig. 1 annotated below, Fig. 1 annotated above; paragraphs [0029]-[0033]). Claim 5 is rejected under 35 U.S.C. 103 as being unpatentable over U.S. Patent Publication 2012/0051956 to Grip in view of U. S. Patent Publication 2014/0161644 to Weatherley and U. S. Patent 7,850,593 to Vincent. Referring to claim 5, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 1, as detailed above, but do not teach ball valves. Vincent teaches a system wherein: a set of ports (60, 62) includes an inlet ball check valve (70) and an outlet ball check valve (72) (Fig. 1; col. 3, lines 40-61). It would have been obvious before the invention was effectively filed, to a person having ordinary skill in the art, to modify the pump system taught by Grip with the check valves taught by Vincent in order to control the flow of fluid in an out of the pump chamber during operation and prevent the reverse flow of fluid through the pump, or when shutdown, any flow. Claim 6 is rejected under 35 U.S.C. 103 as being unpatentable over U.S. Patent Publication 2012/0051956 to Grip in view of U. S. Patent Publication 2014/0161644 to Weatherley and U. S. Patent Publication 2004/0086397 to Bowen. Referring to claim 6, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 1, as detailed above, but are silent as to the details of the diaphragm. Bowen teaches a pump wherein: an edge-mounted diaphragm (24) comprises three layers (Fig. 1, paragraph [0031]). It would have been obvious before the invention was effectively filed, to a person having ordinary skill in the art, to modify the pump system taught by Grip with the diaphragm layering taught by Bowen in order to cool the diaphragm (Bowen paragraph [0031]). Claim 7 is rejected under 35 U.S.C. 103 as being unpatentable over U.S. Patent Publication 2012/0051956 to Grip in view of U. S. Patent Publication 2014/0161644 to Weatherley, U. S. Patent Publication 2018/0180038 to Centofante and U. S. Patent Publication 2008/0216898 to Grant. Referring to claim 7, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 1, as detailed above, but do not teach a system wherein the pump-valving assembly is preload sensitive and afterload sensitive. Centofante teaches a pump wherein: the pump-valving assembly is preload sensitive (paragraph [0030]). It would have been obvious before the invention was effectively filed, to a person having ordinary skill in the art, to modify the pump system taught by Grip with the preload sensitivity taught by Centofante in order to keep the pump full of fluid and make the pump self priming (paragraph [0030]). Centofante also does not teach a system wherein the pump-valving assembly is afterload sensitive. Grant teaches a system wherein: the pump-valving assembly is afterload sensitive (paragraph [0228]). It would have been obvious before the invention was effectively filed, to a person having ordinary skill in the art, to modify the pump system taught by Grip with the afterload sensitivity taught by Grant in order to prevent unsafe pressures (paragraph [0228]). Claims 8-10 are rejected under 35 U.S.C. 103 as being unpatentable over U.S. Patent Publication 2012/0051956 to Grip in view of U. S. Patent Publication 2014/0161644 to Weatherley and U. S. Patent Publication 2004/0191098 to Wu. Referring to claim 8, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 1, as detailed above, and including wherein the control housing is removably secured to the integral housing, but do not teach compliant members between the flange and the control housing. Wu teaches a pump wherein: a flange (on 10) has a set of compliant members (382) to physically bias the flange (on 10) in a housing (30) (Figures 2-4; paragraph [0035]). It would have been obvious before the invention was effectively filed, to a person having ordinary skill in the art, to modify the pump system taught by Grip with the ball detents taught by Wu in order to secure the integral pump assembly to the motor in such a way that also provides for radial alignment there between. Referring to claim 9, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 8, as detailed above, and including wherein the control housing is removably secured to the integral housing, but do not teach compliant members between the flange and the control housing. Wu further teaches a pump wherein: each compliant member (382) includes a spring (381) (Figures 2-4; paragraph [0035]). Referring to claim 10, Grip and Weatherly teach a pulsatile fluid pump system comprising all the limitations of claim 9, as detailed above, and including wherein the control housing is removably secured to the integral housing, but do not teach compliant members between the flange and the control housing. Wu further teaches a pump wherein: the set of compliant members (382) is included in a set of ball detents (38) (Figures 2-4; paragraph [0035]). Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Dorfler and Algawi teach similar pump systems as the claimed system. Any inquiry concerning this communication or earlier communications from the examiner should be directed to BRYAN MATTHEW LETTMAN whose telephone number is (571)270-7860. The examiner can normally be reached Monday-Friday 8am-4pm. 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, Essama Omgba can be reached at 469-295-9278. 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. /BRYAN M LETTMAN/Primary Examiner, Art Unit 3746
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Prosecution Timeline

Sep 06, 2024
Application Filed
Sep 18, 2025
Non-Final Rejection — §103
Jan 23, 2026
Response Filed
Jan 23, 2026
Response after Non-Final Action

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12577960
FLUID PUMP WITH EMBEDDED HEAT DISSIPATING PLATE
2y 5m to grant Granted Mar 17, 2026
Patent 12565877
ELECTRICALLY OPERATED LINEAR PUMP AND PUMP DRIVE
2y 5m to grant Granted Mar 03, 2026
Patent 12565893
REVERSING POLARITY OF A PUMP ON FAILURE, AND APPLICATIONS THEREOF
2y 5m to grant Granted Mar 03, 2026
Patent 12565878
RADIAL PISTON PUMPS
2y 5m to grant Granted Mar 03, 2026
Patent 12560158
DIAPHRAGM PUMP
2y 5m to grant Granted Feb 24, 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
65%
Grant Probability
99%
With Interview (+52.5%)
3y 2m
Median Time to Grant
Low
PTA Risk
Based on 941 resolved cases by this examiner. Grant probability derived from career allow rate.

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