Prosecution Insights
Last updated: October 04, 2026
Application No. 18/221,383

PROCESS AND APPARATUS FOR SEPARATING CATALYST FROM PRODUCT GAS

Final Rejection §102§103§112
Filed
Jul 12, 2023
Priority
Jul 14, 2022 — provisional 63/389,345
Examiner
BUI, DUNG H
Art Unit
1773
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Uop LLC
OA Round
3 (Final)
78%
Grant Probability
Favorable
4-5
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allowance Rate
991 granted / 1273 resolved
+12.8% vs TC avg
Strong +25% interview lift
Without
With
+25.4%
Interview Lift
resolved cases with interview
Typical timeline
2y 6m
Avg Prosecution
58 currently pending
Career history
1329
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
50.1%
+10.1% vs TC avg
§102
24.8%
-15.2% vs TC avg
§112
19.0%
-21.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1273 resolved cases

Office Action

§102 §103 §112
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 Interpretation The phrase of “for disengaging catalyst from a product gas”, “reactor”, and “disengagement” is understood as being directed to and further reciting the purpose or intended use of the claimed invention which does not result in a structural difference (or, in the case of process claims, manipulative difference) between the claimed invention and the prior art do not limit the claim and do not distinguish over the prior art apparatus (or process). See, e.g., In re Otto, 312 F.2d 937, 938, 136 USPQ 458, 459 (CCPA 1963); In re Sinex, 309 F.2d 488, 492, 135 USPQ 302, 305 (CCPA 1962). If a prior art structure is capable of performing the intended use as recited in the claimed invention, then it meets the claim. See, e.g., In re Schreiber, 128 F.3d 1473, 1477, 44 USPQ2d 1429, 1431 (Fed. Cir. 1997) and cases cited therein, as it has been held that the recitation of a new intended use for an old product does not make a claim to that old product patentable. In re Schreiber, 44 USPQ2d 1429 (Fed. Cir. 1997). See also MPEP § 2111.02 and § 2112 - § 2112.02. Additionally, the term “riser” is interpreted as non-limiting nomenclature (mere name-calling) that does not impart any particular structural distinction. According, the “riser” is reasonably construed as a conduit or pipe. Similarly, the term “feed distributor” is construed as a flow-distribution conduit or structure, the term “disengagement chamber” as a chamber, and the term “reactor vessel” as a vessel. Under this construction, the at least claim 8 has been interpreted as follows: “An apparatus comprising: a first conduit comprising a first flow-distribution structure and a first centrifugal or inertial discharge opening, the first conduit terminating within a vessel; a second conduit comprising a second flow-distribution structure and a second tangential discharge opening; a first chamber located within the vessel and containing the first discharge opening; and a second chamber located within the same vessel and containing the second discharge opening.” In dependent claim 21 is interpreted in the same manner. Claim Rejections - 35 USC § 112 The following is a quotation of the first paragraph of 35 U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. The following is a quotation of the first paragraph of pre-AIA 35 U.S.C. 112: The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor of carrying out his invention. Claims 8-24 are rejected under 35 U.S.C. 112(a) or 35 U.S.C. 112 (pre-AIA ), first paragraph, as failing to comply with the written description requirement. The claim(s) contains subject matter which was not described in the specification in such a way as to reasonably convey to one skilled in the relevant art that the inventor or a joint inventor, or for applications subject to pre-AIA 35 U.S.C. 112, the inventor(s), at the time the application was filed, had possession of the claimed invention. Claim 8 recites “a first centrifugal or inertial discharge opening” in line 5. Examiner has consulted the Specification passages identified by Applicant ([0027] and [0028] as filed) and find no disclosure therein that evinces possession of “inertial discharge opening.” Those paragraphs disclose only an “inertial separation device,” which is distinct from the claimed “inertial discharge opening.” Claim 21 is likewise rejected with similar reasons as set forth above in claim 8. Claims 9-20 and 22-24 depend on claims 8, 21; and hence are also rejected. 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) 8-15 and 18 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Oh (US 20070079582). As regarding claim 8, Oh discloses the claimed invention for an apparatus comprising: a first conduit (riser) comprising a first discharge opening, the first conduit (riser) terminating within a vessel; a second conduit (riser) comprising a second discharge opening; a first chamber located within the vessel and containing the first discharge opening; and a second chamber located within the same vessel and containing the second discharge opening (annotated fig. 6). PNG media_image1.png 508 716 media_image1.png Greyscale As regarding claim 9, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein the first riser is centrally located in the first disengagement chamber and the second discharge opening is located in a wall of the second disengagement chamber (annotated fig. 6). As regarding claim 10, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein the second disengagement chamber surrounds the first disengagement chamber (annotated fig. 6). As regarding claim 11, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein the second disengagement chamber is annular to the first disengagement chamber (annotated fig. 6). As regarding claim 12, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein the inner wall of the second disengagement chamber is the outer wall of the first disengagement chamber (annotated fig. 6). As regarding claim 13, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for a first upper outlet of the first disengagement chamber located proximate to a second upper outlet of the second disengagement chamber (annotated fig. 6). As regarding claim 14, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein the first upper outlet and the second upper outlet are below a cyclone inlet (annotated fig. 6). As regarding claim 15, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein the first disengagement chamber is supported by the second disengagement chamber which is supported by the reactor vessel or the second disengagement chamber is supported by the first disengagement chamber which is supported by the reactor vessel (annotated fig. 6). As regarding claim 18, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention for wherein said second riser includes a transfer conduit for transferring catalyst and product gas to the second disengagement chamber, said transfer conduit comprising a riser outlet pipe and a disengagement inlet pipe that slide relative to each other (annotated fig. 6). Claim(s) 8 and 19-24 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Ni (US 20100132316). As regarding claim 8, Oh discloses the claimed invention for an apparatus comprising: a first conduit (riser) comprising a first discharge opening, the first conduit (riser) terminating within a vessel; a second conduit (riser) comprising a second discharge opening; a first chamber located within the vessel and containing the first discharge opening; and a second chamber located within the same vessel and containing the second discharge opening (annotated fig. 7). PNG media_image2.png 416 512 media_image2.png Greyscale As regarding claim 19, Ni discloses all of limitations as set forth above. Ni discloses the claimed invention for a first lower outlet of the first disengagement chamber located proximate to a second lower outlet of the second disengagement chamber (annotated fig. 7). As regarding claim 20, Ni discloses all of limitations as set forth above. Ni discloses the claimed invention for wherein the first lower outlet and the second lower outlet are above a catalyst stripper (annotated fig. 7). Claim 21 is likewise rejected for reasons analogous to those set forth for claim 8 above. As regarding claim 22, Ni discloses all of limitations as set forth above. Ni discloses the claimed invention for wherein the first riser is centrally located in the first disengagement chamber and the second discharge opening is located in a side wall of the second disengagement chamber (annotated fig. 7). As regarding claim 23, Ni discloses all of limitations as set forth above. Ni discloses the claimed invention for wherein the second disengagement chamber is annular to the first disengagement chamber (annotated fig. 7). As regarding claim 24, Ni discloses all of limitations as set forth above. Ni discloses the claimed invention for wherein the inner wall of the second disengagement chamber is the outer wall of the first disengagement chamber (annotated fig. 7). 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. Claim(s) 17 is rejected under 35 U.S.C. 103 as being unpatentable over Oh (US 20070079582), as applied supra, and further in view Palmas et al (US 20150005553; hereinafter Palmas). As regarding claim 17, Oh discloses all of limitations as set forth above. Oh discloses the claimed invention except for a third riser comprising a third discharge opening and said second disengagement chamber containing the third discharge opening. It would have been obvious to one having ordinary skill in the art before the effective filing date of the invention was made to provide a third riser comprising a third discharge opening and said second disengagement chamber containing the third discharge opening enhance cyclonic flowrate, since it was known in the cyclonic separator art as shown in Palmas (145 or 245 of fig. 2). Allowable Subject Matter The following is an examiner’s statement of reasons for allowance: Claim 16 contains allowable subject matter because prior art does not teach fairly suggested a support lug extends between the first disengagement chamber and the second disengagement chamber in said second disengagement chamber; said lug is oriented radially so as to impede a mixture of catalyst and product gas from swirling in the second disengagement chamber. Any comments considered necessary by applicant must be submitted no later than the payment of the issue fee and, to avoid processing delays, should preferably accompany the issue fee. Such submissions should be clearly labeled “Comments on Statement of Reasons for Allowance.” Response to Arguments Applicant's arguments filed 07/30/26 have been fully considered but they are not persuasive. Applicant’s remarks on page 7 have been considered but are not persuasive. Applicant’s arguments rely primarily on the nomenclature or conventional characterization of the disclosed structures (e.g., “reactor riser” and “feed distributor”) rather than on any particular structural limitation imposed by those terms. As discussed above, the terms “riser” and “feed distributor” do not, by themselves, impart a particular structural distinction beyond the corresponding physical structures reasonably understood by one of ordinary skill in the art. As set forth in the foregoing claim interpretation above, the “riser” is reasonably construed as a conduit or pipe, the “feed distributor” as a flow-distribution structure or conduit, and the “reactor vessel” as a vessel. Under this interpretation, the teachings of Oh and Ni are not excluded by Applicant’s characterization of their respective structures as being associated with a reactor or vacuum cleaner. In particular, as shown in the annotated fig. 1 of Oh and annotated fig. 2 of Ni (above), Oh and Ni references disclose structures corresponding to the claimed conduits, flow-distribution structures, discharge openings, and chambers, including the claimed spatial relationships among those structures. Applicant’s assertion that the disclosed structures cannot constitute the claimed “riser” or “feed distributor” merely because Oh and Ni concern dust separation rather than hydrocarbon catalytic cracking is unpersuasive, as the claim language does not structurally limit the “riser” or “feed distributor” to a hydrocarbon reactor beyond the limitations expressly recited in the claim. Accordingly, Applicant has not identified a structural distinction between the claimed features and the structures disclosed in Oh and Ni. As demonstrated by the annotated figures, Oh and Ni disclose the limitations of claims 8 and 21 under the above claim interpretation. Therefore, Applicant’s arguments regarding the alleged absence of the first and second feed distributors and reactor risers are not persuasive. Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to DUNG H BUI whose telephone number is (571)270-7077. The examiner can normally be reached Monday-Friday 8:00 - 4:30 ET. 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, Benjamin L. Lebron can be reached at (571) 272-0475. 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. /DUNG H BUI/ Primary Examiner, Art Unit 1773
Read full office action

Prosecution Timeline

Show 1 earlier event
Oct 23, 2025
Non-Final Rejection mailed — §102, §103, §112
Jan 22, 2026
Response after Non-Final Action
Jan 22, 2026
Response Filed
Feb 10, 2026
Response Filed
Apr 30, 2026
Final Rejection mailed — §102, §103, §112
Jul 30, 2026
Request for Continued Examination
Aug 01, 2026
Response after Non-Final Action
Aug 25, 2026
Final Rejection mailed — §102, §103, §112 (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

4-5
Expected OA Rounds
78%
Grant Probability
99%
With Interview (+25.4%)
2y 6m (~0m remaining)
Median Time to Grant
High
PTA Risk
Based on 1273 resolved cases by this examiner. Grant probability derived from career allowance rate.

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