Prosecution Insights
Last updated: April 19, 2026
Application No. 18/608,340

METHOD FOR CALCULATING INFUSION RATE USING A DRIP CHAMBER

Non-Final OA §101§102
Filed
Mar 18, 2024
Examiner
MERCADO, ALEXANDER A
Art Unit
2855
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Carefusion 303 Inc.
OA Round
1 (Non-Final)
69%
Grant Probability
Favorable
1-2
OA Rounds
3y 0m
To Grant
89%
With Interview

Examiner Intelligence

Grants 69% — above average
69%
Career Allow Rate
409 granted / 593 resolved
+1.0% vs TC avg
Strong +20% interview lift
Without
With
+19.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 0m
Avg Prosecution
35 currently pending
Career history
628
Total Applications
across all art units

Statute-Specific Performance

§101
3.1%
-36.9% vs TC avg
§103
45.1%
+5.1% vs TC avg
§102
16.9%
-23.1% vs TC avg
§112
31.2%
-8.8% vs TC avg
Black line = Tech Center average estimate • Based on career data from 593 resolved cases

Office Action

§101 §102
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 § 101 35 U.S.C. 101 reads as follows: Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title. Claims 1 – 20 are rejected under 35 U.S.C. 101 because the claimed invention is directed to non-statutory subject matter. The claim(s) does/do not fall within at least one of the four categories of patent eligible subject matter because: Regarding Claim 1, the claim recites the judicial exception of an abstract idea, specifically a mathematical concept and mental process in the limitation “determining the infusion rate by measuring a time elapsed unit the fluid reaches the reference mark in the housing”. The additional elements in the claim are the “providing”, “receiving”, and “rotating” steps. These elements are extra-solution activity merely present to collect data for use in the mathematical concept and mental process. Furthermore, as a whole, the elements are not an improvement on the technology as they pertain to the generic use of a drip chamber and no limitation is recited which utilizes the result of the determination. The additional elements do not provide significantly more, as a whole or in combination, as they are well-understood, routine, and conventional. See at least GB 858731. Regarding Claim 10, the claim recites the judicial exception of an abstract idea, specifically a mathematical concept and mental process in the limitation “determining the infusion rate by measuring a time elapsed until the fluid fills the flow collector”. The additional elements in the claim are the “providing” and “receiving” steps. These elements are extra-solution activity merely present to collect data for use in the mathematical concept and mental process. Furthermore, as a whole, the elements are not an improvement on the technology as they pertain to the generic use of a drip chamber and no limitation is recited which utilizes the result of the determination. The additional elements do not provide significantly more, as a whole or in combination, as they are well-understood, routine, and conventional. See at least GB 858731. Claims 2 – 5, 7 – 9, 11 – 13, and 15 – 20 all recite additional elements which are not an improvement on the technology as they pertain to the generic use of a drip chamber and do not provide significantly more, as a whole or in combination, as they are well-understood, routine, and conventional. See at least GB 858731. Claims 6 and 14 further limit the mathematical concept and mental process. 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. Claim(s) 1 - 20 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Leonard (GB 858731). Regarding Claim 1, Leonard discloses a method for calculating an infusion rate in a drip chamber, the method comprising: providing a housing (20) receiving a fluid (Figure 1) (Page 2, lines 72 – 75), the housing configured to receive the fluid at a distal end (via 22) and expel the fluid at a proximal end (via 26), the housing comprising a reference mark (28) (Page 2, lines 63 – 71); receiving, at the proximal end of the housing, a flow controller (53) rotatably coupled to the housing (Figure 1), the flow controller comprising an aperture extending therethrough (aperture in which 29 lies) (Figure 1); rotating the flow controller relative to the housing such that the aperture prevents the fluid from traveling therethrough (53 inherently rotates with respect to the housing to close e.g. when legs of the clamp come closer together) (Page 2, lines 113 – 115) (Figure 1); and determining the infusion rate by measuring a time elapsed until the fluid reaches the reference mark in the housing (Page 4, lines 112 – 125). Regarding Claim 2, Leonard discloses the flow controller (Leonard teaches the flow controller being a plug valve) (Page 2, lines 113 – 122) comprises an inner member (the body inherently present in the plug valve) and an outer member (the plug inherently present in a plug valve), the inner member being fixed relative to the housing (the body inherently being fixed via 29) and the outer member being rotatable relative to the inner member (inherently how a plug valve opens and closes). Regarding Claim 3, Leonard discloses the outer member and the inner member each comprise an aperture extending therethrough (inherently in a plug valve to provide a flow path when opened). Regarding Claim 4, Leonard discloses rotating the outer member relative to the inner member such that the apertures do not align prevents the fluid from traveling through the flow controller (inherently how a plug valve functions). Regarding Claim 5, Leonard discloses a volume of the housing at the reference mark is known (Page 2, lines 63 – 71). Regarding Claim 6, Leonard discloses determining the infusion rate comprises: dividing the volume by the time elapsed until the fluid reaches the reference mark (Page 4, lines 112 – 125). Regarding Claim 7, Leonard discloses the housing comprises more than one reference mark (Figure 1). Regarding Claim 8, Leonard discloses receiving, at a proximal end of the flow controller, a tubing (29) configured to receive the fluid (Figure 1). Regarding Claim 9, Leonard discloses the flow controller comprises more than one aperture (at least at the top and bottom) (Figure 1). Regarding Claim 10, Leonard discloses a method for calculating an infusion rate in a drip chamber, the method comprising: providing a housing (20) receiving a fluid (Figure 1) (Page 2, lines 72 – 75), the housing configured to receive the fluid at a distal end (via 22) and expel the fluid at a proximal end (via 35) (Page 3, lines 113 – 121); receiving, in the housing, a flow collector (Figure 6); and determining the infusion rate by measuring a time elapsed until the fluid fills the flow collector (Page 4, lines 112 – 125). Regarding Claim 11, Leonard discloses the flow collector comprises a septum at a proximal end thereof (38, 43). Regarding Claim 12, Leonard discloses a radial force acting upon the flow collector opens the septum thereby establishing a fluid pathway therethrough (Page 5, lines 13 – 25). Regarding Claim 13, Leonard discloses volume of the flow collector is known (Page 4, lines 50 – 55). Regarding Claim 14, Leonard discloses determining the infusion rate comprises: dividing the volume by the time elapsed until the fluid fills the flow collector (Page 4, lines 112 – 125). Regarding Claim 15, Leonard discloses the flow collector has a diameter smaller than a diameter of the housing (as the flow collector is in the housing, its diameter is inherently smaller than that of the housing) (Page 4, lines 47 – 50). Regarding Claim 16, Leonard discloses receiving, at a proximal end of the housing, a tubing configured to receive the fluid (inherently present as the fluid is intended to continue flowing) (Page 1, lines 58 – 63). Regarding Claim 17, Leonard discloses the flow collector is coupled to the housing by at least one arm (40). Regarding Claim 18, Leonard discloses the flow collector is received at a center of the housing (Figure 4). Regarding Claim 19, Leonard discloses the flow collector is fixed relative to the housing (inherent for the device to function) (Figure 4). Regarding Claim 20, Leonard discloses the flow collector allows for continuous use of the drip chamber when filled with the fluid (Page 4, line 112 - Page 5, line 5). Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to ALEXANDER MERCADO whose telephone number is (571)270-7094. The examiner can normally be reached Monday - Thursday 9am - 4pm EST. 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, Laura Martin can be reached at (571) 272-2160. 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. ALEXANDER A. MERCADO Primary Examiner Art Unit 2855 /ALEXANDER A MERCADO/ Primary Examiner, Art Unit 2855
Read full office action

Prosecution Timeline

Mar 18, 2024
Application Filed
Feb 18, 2026
Non-Final Rejection — §101, §102 (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
69%
Grant Probability
89%
With Interview (+19.6%)
3y 0m
Median Time to Grant
Low
PTA Risk
Based on 593 resolved cases by this examiner. Grant probability derived from career allow rate.

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