Prosecution Insights
Last updated: May 29, 2026
Application No. 18/813,726

PRINT HEAD AND METHOD OF MANUFACTURING PRINT HEAD

Non-Final OA §103
Filed
Aug 23, 2024
Priority
Aug 25, 2023 — JP 2023-137533
Examiner
UHLENHAKE, JASON S
Art Unit
2853
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Canon Kabushiki Kaisha
OA Round
1 (Non-Final)
87%
Grant Probability
Favorable
1-2
OA Rounds
4m
Est. Remaining
85%
With Interview

Examiner Intelligence

Grants 87% — above average
87%
Career Allowance Rate
1020 granted / 1170 resolved
+19.2% vs TC avg
Minimal -2% lift
Without
With
+-2.5%
Interview Lift
resolved cases with interview
Fast prosecutor
2y 2m
Avg Prosecution
26 currently pending
Career history
1205
Total Applications
across all art units

Statute-Specific Performance

§101
0.3%
-39.7% vs TC avg
§103
81.0%
+41.0% vs TC avg
§102
15.0%
-25.0% vs TC avg
§112
0.7%
-39.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1170 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 . 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 (i.e., changing from AIA to pre-AIA ) 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. Claim(s) 1, 3, 7-9 is/are rejected under 35 U.S.C. 103 as being unpatentable over Tomikawa et al (U.S. Pat. 5,969,738) in view of Shinada et al (U.S. Pat. 6,899,417) Regarding claim 1, Tomikawa discloses a method of manufacturing a print head including a printing element board having an ejection port array being an array of a plurality of ejection ports for ejecting a liquid (Figure 1; Column 2, Lines 48-52) A box part in which an accommodation chamber to accommodate the liquid is formed (Figure 1; Column 2, Line 48 – Column 3, Line 10) A channel formation part in which a channel configured to supply the liquid in the accommodation chamber to the ejection port array is formed (Figures 7-8; Column 6, Lines 32-55) A lid member (top portion of element 6; Figure 1) covering an opening of the box part to define the accommodation chamber (Figure 1) Method comprising: preparing a lid member, the lid member not including a supply port (Figure 1) A second print head joins the second lid member to the housing, the second print head being detachably attachable to a printing apparatus and configured to eject the liquid from the ejection ports without the accommodation chamber supplied with the liquid (Figure 1; Figure 1; Column 1, Lines 49-52; Column 2, Line 48 – Column 3, Line 10; recording head an ink tank are detachable) Shinada discloses it is known in the art for a lid member (4) to include a supply port (10) through which the accommodation chamber can be supplied with liquid; and forming a first print head by joining the lid member to the housing, the first print head configured to eject the liquid from the ejection ports with the accommodation chamber supplied with the liquid through the supply port (Figures 4, 6; Abstract; Column 4, Lines 55-65; Column 5, Lines 26-33) It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to incorporate the teaching of Shinada into the device of Tomikawa, for the purpose of providing a continuous sink supply with an ink injection port for injecting ink into the ink accommodating chamber Regarding claim 3, Shinada discloses it is known in the art to use an air communicating port (11) formed in the lid (Figure 2; Column 4, Lines 55-65) It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to incorporate the teaching of Shinada into the device of Tomikawa, for the purpose of reducing the pressure inside the container body Regarding claim 7, Tomikawa discloses shaping the box part and the channel formation part; and forming the housing by joining the shaped boxy part and the shaped channel formation part (Figures 1, 7-8; Column 6, Lines 32-55) Regarding claim 8, Tomikawa discloses attaching the printing element board to the housing such that the channel and the plurality of ejection ports are continuous with each other (Figure 1; Column 2, Lines 48-52) Regarding claim 9, Tomikawa discloses the printing element board attached to the housing in the attaching is provided with a heating resistance element (4) that differs in size between the print heads (Figure 1; Column 3, Lines 34-42) Allowable Subject Matter Claims 2, 4-6 are objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. The following is a statement of reasons for the indication of allowable subject matter: The primary reason for the allowance of claims 10-13 is the inclusion of the limitation of the channel includes a first air buffer configured to hold a bubble generated in the channel and discharging the bubble in a case where a suction operation of sucking the liquid from the ejection ports is performed; and a narrow channel connected to an upstream side of the first air buffer, and has a cross-sectional area smaller than a cross-sectional area of the first air buffer as viewed from a direction in which the liquid flows in the suction operation. It is this limitation found in each of the claims, as it is claimed in the combination, that has not been found, taught or suggested by the prior art of record which makes these claims allowable over the prior art. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to JASON S UHLENHAKE whose telephone number is (571)272-5916. The examiner can normally be reached Monday-Friday, 8:00 am - 5:00 pm. 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, Douglas X. Rodriguez can be reached at (571) 431-0716. 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. /JASON S UHLENHAKE/Primary Examiner, Art Unit 2853 February 11, 2026
Read full office action

Prosecution Timeline

Aug 23, 2024
Application Filed
Feb 13, 2026
Non-Final Rejection mailed — §103
May 13, 2026
Response Filed

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12636883
INKJET PRINTING APPARATUS AND INKJET PRINTING METHOD USING THE SAME
2y 6m to grant Granted May 26, 2026
Patent 12623476
PRINTER ROLLER CLEANING SHEETS AND METHOD OF USE THEREOF
2y 10m to grant Granted May 12, 2026
Patent 12623458
METHOD FOR CLEANING LIQUID EJECTING HEAD
2y 3m to grant Granted May 12, 2026
Patent 12617199
Liquid Ejecting Apparatus And Liquid Ejecting Method
2y 5m to grant Granted May 05, 2026
Patent 12600129
DISCHARGE UNIT, LIQUID DISCHARGE HEAD, AND MANUFACTURING METHOD OF DISCHARGE UNIT
2y 5m to grant Granted Apr 14, 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
87%
Grant Probability
85%
With Interview (-2.5%)
2y 2m (~4m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1170 resolved cases by this examiner. Grant probability derived from career allowance rate.

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