Prosecution Insights
Last updated: July 17, 2026
Application No. 18/524,448

HIGH RESILIENCE, LOW COMPRESSION SET, ABRASION RESISTANT HYDROGENATED NITRILE BUTADIENE RUBBER (HNBR) COMPOUND FOR HIGH TEMPERATURE HIGH PRESSURE O&G APPLICATIONS

Non-Final OA §102§103
Filed
Nov 30, 2023
Examiner
RODD, CHRISTOPHER M
Art Unit
Tech Center
Assignee
China National Petroleum Corporation
OA Round
1 (Non-Final)
73%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
84%
With Interview

Examiner Intelligence

Grants 73% — above average
73%
Career Allowance Rate
580 granted / 795 resolved
+13.0% vs TC avg
Moderate +11% lift
Without
With
+11.1%
Interview Lift
resolved cases with interview
Typical timeline
2y 4m
Avg Prosecution
29 currently pending
Career history
821
Total Applications
across all art units

Statute-Specific Performance

§101
0.3%
-39.7% vs TC avg
§103
63.4%
+23.4% vs TC avg
§102
7.7%
-32.3% vs TC avg
§112
14.0%
-26.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 795 resolved cases

Office Action

§102 §103
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 . 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. 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. Claims 1-2, 7-9 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Tokumitsu (U.S. 20040266938). Note the as-filed specification discloses “about” is +/- 20 % of the claimed value. (see page 3 of the as-filed specification. (repeated below) PNG media_image1.png 100 718 media_image1.png Greyscale For the instant case, relevant to the Claim 3, abouts 80 parts +/- 20 % is 64 – 96 parts. In ¶[0020] Tokumitsu teaches a hydrogenated NBR (HNBR) which has a Mooney viscosity as claimed of 70 and a bound acrylonitrile content of 44.2% which anticipates these values in Claim 1. (See abstract for specific Mooney 1-4 100 oC teaching and bound teaching). The amount of 100 parts of HNBR anticipates the hydrogenated nitrile rubber of Claim 1 and Claim 2’s list of hydrogenate nitrile rubbers (hydrogenating conjugated dienes). The carbon black is 90 parts which makes the sum total 100 + 90 which anticipates the sum total of Claim 1. Additionally, summing all fillers in the example of Tokumitsu (carbon black, carbon fiber and graphite) is 150 parts of filler which anticipates at least 140 limitation of Claim 1 if interpreted to be the sum total of fillers in the composition. The sum total is reasonably suggested to be interpretated as sum total of HNBR and filler (carbon black) as the as-filed specification does not further disclose an alternative interpretation nor definition and the as-filed specification examples of rubber + filler (carbon black) all sum to at least 140 parts. Furthermore, the as-filed specification does not disclose any additional fillers nor does it reasonably suggest the additional additives of the demonstrations in the as-filed specification can be considered fillers. Further, the exemplified amounts in the inventive examples of the as-filed specification do not sum to at least 140 parts sum total at every instance unless the above interpretation is valid. Claim 3 is anticipated as above as the about 80 limitation on the range encompasses 64 to 96 parts under Applicant’s definition and 90 parts carbon black anticipates said defined range. Claim 7, Claim 8, and Claim 9 are anticipated as they are simply different combinations of the above claims and are anticipated for the same reasons. 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. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claims 3-6, 10-20 are rejected under 35 U.S.C. 103 as being unpatentable over Tokumitsu (U.S. 20040266938) in view of Vulcan 3 technical datasheet and as evidenced by Omnés “Effective Properties of carbon black filled natural rubber: Experiments and modeling”. Tokumitsu is applied under §102 above. In the event Applicant changes the limits to a smaller +/- range, Tokumitsu is still applicable for the reasons put forth below with respect to the amount of carbon black and, additionally, the particle size, surface area and OAN not specifically taught by Tokumitsu. (Claims 4-6). In ¶[0020] Tokumitsu teaches a hydrogenated NBR (HNBR) which has a Mooney viscosity as claimed of 70 and a bound acrylonitrile content of 44.2% which reads over these values in Claim 1. (See abstract for specific Mooney 1-4 100 oC teaching and bound teaching). The amount of 100 parts of HNBR reads over the hydrogenated nitrile rubber of Claim 1. The carbon black is 90 parts which makes the sum total 100 + 90 which reads over the sum total of Claim 1. The sum total is reasonably suggested to be interpretated as sum total of HNBR and filler (carbon black) as the as-filed specification does not further disclose an alternative interpretation nor definition and the as-filed specification examples of rubber + filler (carbon black) all sum to at least 140 parts. Furthermore, the as-filed specification does not disclose any additional fillers nor does it reasonably suggest the additional additives of the demonstrations in the as-filed specification can be considered fillers. Further, the exemplified amounts in the inventive examples of the as-filed specification do not sum to at least 140 parts sum total at every instance unless the above interpretation is valid. The amount of 90 parts carbon black is not in the explicit range (not considering “about” language) of Claim 3, and, further, Tokumitsu does not teach or suggest particle sizes, surface area nor OAN of Claims 4-6. With respect to the amount of carbon black, Tokumitsu teaches in 30 to 100 parts of carbon black (¶[0011]). It would have been obvious to a person having ordinary skill in the art at the time the invention was filed to practice the invention of Tokumitsu, in particular that of Example 1 above, such that the amount of carbon black was 30 -100 parts because Tokumitsu teaches this amount it recommended. One of ordinary skill in the art would have been motivated to maintained the total amount of filler and adjust the graphite and carbon fiber accordingly to 150 parts per 100 parts of HNBR because this is the total amount of filler exemplified in Example 1 by Tokumitsu. This 30 to 100 parts of carbon black overlaps the recited range of Claim 3. Note that Applicant has no comparisons of on the effect of changing the amount of the carbon black without changing the particle size, surface area and OAN to the values below. With respect to Claims 4-6, Tokumitsu does not teach or suggest particle sizes, surface area nor OAN of Claims 4-6 and Tokumitsu is not specific to the carbon black to be used. Vulcan 3 teaches a carbon black which has excellent extrusion characteristics processing considerations and can be used in industrial rubber products, conveyer belts, and solid tires to provide moderate abrasion resistance. (See page 1 of the technical data sheet performance features section). Vulcan 3 is ASTM N330 (see page 1 first paragraph). Vulcan 3 also teaches the OAN is 102 which reads over the OAN of Claim 6. Omnés provides evidence in Table 1 page 1142 that N330 has an average particle size of 29 nm and surface area of 84 m2/g which meets the limitations of Claim 4 and Claim 5. It would have been obvious to a person having ordinary skill in the art at the time the invention was filed to practice the invention of Tokumistu, in particular that of Example 1, by substituting the HAF carbon black with Vulcan 3 for the advantage of excellent extrusion characteristics in processing and moderate abrasion resistance as suggested by Vulcan 3 as discussed above. Claims 10-20 are difference combinations of Claim 1-6 which are rejected for the same reasons as Claims 1-6 as discussed above. In general as §103s (including combined with §102) are made in this action, If Applicant intends to argue there is criticality which gives an unexpected result to the compositions in light of the teachings of the prior art, Applicant is reminded such arguments to unexpected results can only be properly considered when all the factors in MPEP §716.02 are properly taken into account. Overcoming a §103 rejection based on unexpected results requires the combination of three different elements: the results must fairly compare with the prior art, the claims must be commensurate in scope and the results must truly be unexpected. (See MPEP §716.02) Applicant’s showing of allegedly unexpected results must satisfy ALL of these requirements. Additionally, MPEP §716.01(b) states a “nexus” between the claimed invention and the evidence of secondary considerations, such as unexpected results, must be present. The burden rests with Applicant to establish results are unexpected and significant. (MPEP §716.02(b)). Note that evidence of secondary considerations, such as unexpected results or commercial success, is irrelevant to 35 U.S.C. 102 rejections and thus cannot overcome a rejection so based. In re Wiggins, 488 F.2d 538, 543, 179 USPQ 421, 425 (CCPA 1973). See MPEP §2131.04. The claims do not appear to be commensurate in scope with the showing of allegedly unexpected results as they are open to any bound AN content, any amount of filler (unbounded above 140 depending on how to interpret “sum of” language) and do not have any of the particulars of the carbon black (such as claims 4-6) in each independent claim. Therefore, for at least these reasons the required nexus between the claims and the showing of allegedly unexpected results is not present at this time. This is also the same analysis for each independent claim. Finally, the results do not appear to be truly unexpected. The results to abrasion resistance appear expected as Vulcan teaches moderate abrasion resistance and Tokumitsu teaches improved wear characteristics (i.e. abrasion characteristic). As there is no indication what the comparative carbon black compared against is and there is no indication the comparative carbon black is known to be better in abrasion resistance over N330, the results appear to expected. In other words, Vulcan suggest the choice of carbon black has an effect on abrasion resistance and there is nothing of record to suggest the abrasion resistance seen in using N330 is giving the expected result vs. other carbon black. Finally, Tokumitsu teaches improved wear which is reasonably suggested to encompass abrasion resistance. With respect to the compression set data disclosed by Applicant in Figure 2, the data is not conclusive of any allegedly unexpected effect from a specific carbon black as the graph reasonably suggest relatively similar behavior between the two carbon blacks tested. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to CHRISTOPHER M RODD whose telephone number is (571)270-1299. The examiner can normally be reached 7 am - 3:30 pm (Pacific). 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, Randy Gulakowski can be reached at (571) 272-1302. 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. /Christopher M Rodd/Primary Examiner, Art Unit 1766
Read full office action

Prosecution Timeline

Nov 30, 2023
Application Filed
Jun 29, 2026
Non-Final Rejection mailed — §102, §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12679971
AEROGEL HYBRID CONTAINING RESIN MIXTURE, PROCESS FOR ITS PRODUCTION AND USE
5y 2m to grant Granted Jul 14, 2026
Patent 12668706
Antibacterial Polymer Composition
3y 10m to grant Granted Jun 30, 2026
Patent 12668657
POLYNORBORNENE-BASED POLYCATIONS
3y 0m to grant Granted Jun 30, 2026
Patent 12655314
LOW VOC COATINGS INCLUDING HYPER-BRANCHED ALKYLATED POLYMERS
4y 1m to grant Granted Jun 16, 2026
Patent 12655287
HIGH IMPACT STRENGTH THERMOPLASTIC COMPOSITIONS
2y 10m to grant Granted Jun 16, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

Strategy Recommendation AI-generated — please review before filing

Get a prosecution strategy drawn from examiner precedents, rejection analysis, and claim mapping.
Typically takes 5-10 seconds — AI-generated, attorney review required before filing

Prosecution Projections

1-2
Expected OA Rounds
73%
Grant Probability
84%
With Interview (+11.1%)
2y 4m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 795 resolved cases by this examiner. Grant probability derived from career allowance rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month