Prosecution Insights
Last updated: April 19, 2026
Application No. 18/308,606

BIOSOLIDS DIGESTER AND PROCESS FOR BIOSOLIDS PRODUCTION

Final Rejection §DP
Filed
Apr 27, 2023
Examiner
HASSAN, LIBAN M
Art Unit
1799
Tech Center
1700 — Chemical & Materials Engineering
Assignee
DVO LICENSING, INC.
OA Round
4 (Final)
50%
Grant Probability
Moderate
5-6
OA Rounds
4y 2m
To Grant
81%
With Interview

Examiner Intelligence

Grants 50% of resolved cases
50%
Career Allow Rate
226 granted / 452 resolved
-15.0% vs TC avg
Strong +31% interview lift
Without
With
+31.3%
Interview Lift
resolved cases with interview
Typical timeline
4y 2m
Avg Prosecution
45 currently pending
Career history
497
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
44.2%
+4.2% vs TC avg
§102
14.5%
-25.5% vs TC avg
§112
34.8%
-5.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 452 resolved cases

Office Action

§DP
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application is being examined under the pre-AIA first to invent provisions. Response to Amendment All the objections and rejections in the previous Office Action not reiterated herein have been withdrawn. Double Patenting The nonstatutory double patenting rejection is based on a judicially created doctrine grounded in public policy (a policy reflected in the statute) so as to prevent the unjustified or improper timewise extension of the “right to exclude” granted by a patent and to prevent possible harassment by multiple assignees. A nonstatutory double patenting rejection is appropriate where the conflicting claims are not identical, but at least one examined application claim is not patentably distinct from the reference claim(s) because the examined application claim is either anticipated by, or would have been obvious over, the reference claim(s). See, e.g., In re Berg, 140 F.3d 1428, 46 USPQ2d 1226 (Fed. Cir. 1998); In re Goodman, 11 F.3d 1046, 29 USPQ2d 2010 (Fed. Cir. 1993); In re Longi, 759 F.2d 887, 225 USPQ 645 (Fed. Cir. 1985); In re Van Ornum, 686 F.2d 937, 214 USPQ 761 (CCPA 1982); In re Vogel, 422 F.2d 438, 164 USPQ 619 (CCPA 1970); In re Thorington, 418 F.2d 528, 163 USPQ 644 (CCPA 1969). A timely filed terminal disclaimer in compliance with 37 CFR 1.321(c) or 1.321(d) may be used to overcome an actual or provisional rejection based on nonstatutory double patenting provided the reference application or patent either is shown to be commonly owned with the examined application, or claims an invention made as a result of activities undertaken within the scope of a joint research agreement. See MPEP § 717.02 for applications subject to examination under the first inventor to file provisions of the AIA as explained in MPEP § 2159. See MPEP §§ 706.02(l)(1) - 706.02(l)(3) for applications not subject to examination under the first inventor to file provisions of the AIA . A terminal disclaimer must be signed in compliance with 37 CFR 1.321(b). The USPTO Internet website contains terminal disclaimer forms which may be used. Please visit www.uspto.gov/patent/patents-forms. The filing date of the application in which the form is filed determines what form (e.g., PTO/SB/25, PTO/SB/26, PTO/AIA /25, or PTO/AIA /26) should be used. A web-based eTerminal Disclaimer may be filled out completely online using web-screens. An eTerminal Disclaimer that meets all requirements is auto-processed and approved immediately upon submission. For more information about eTerminal Disclaimers, refer to www.uspto.gov/patents/process/file/efs/guidance/eTD-info-I.jsp. Claim(s) 2 and 19 is/are rejected on the ground of nonstatutory double patenting as being unpatentable over claim(s) 1-11 of U.S. Patent No. 10,717,684. Although the claims at issue are not identical, they are not patentably distinct from each other because despite difference of wording each of the limitation of the instant claims, and claims 1-11, each taken as a whole, commonly recite substantially all the features of system, except differing in claim construction and in order of recitation of the system components. Furthermore, although patent ‘684 recites additional elements not recited in the instant claims, the instant claims use open claim language “comprising” and therefore do not exclude the presence of additional Allowable Subject Matter Claim(s) 2, 5-12, 14 and 17-19 is/are allowed. The following is a statement of reasons for the indication of allowable subject matter: Regarding claim 2 and its dependent claims, the prior art of record does not disclose or fairly anticipate the combinations of elements as recited in claim 2. In particular, the prior art of record fails to disclose the waste processing system of claim 2, including the limitations: a closed container having a sludge pit, a heating pit comprising an inlet wall and an outlet wall, wherein the inlet wall separates the heating pit from the sludge pit and has an opening configured to receive waste material from the sludge pit, wherein the heating pit comprises a first heating device, and an effluent pit that is adjacent to and shares the outlet wall with the heating pit, and wherein the effluent pit comprises heating racks, in combination with all the elements recited in claim 2. The closest prior art to the claimed invention is Dvorak (previously cited, WO 2008/066546-A1). Dvorak discloses a waste processing system comprising a closed container (enclosure (20)) comprising a anaerobic digester with a mixing chamber (chamber 30) and a methanogenic chamber (40) for digesting the waste material, and a sludge pit (60). However, Dvorak fails to disclose said limitations set forth above. Response to Arguments Applicant's arguments filed on December 2, 2025 have been fully considered. However, it should be noted that no terminal disclaimer over the ‘684 patent has been filed. Conclusion THIS ACTION IS MADE FINAL. 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 LIBAN M HASSAN whose telephone number is (571)270-7636. The examiner can normally be reached on 8:30 - 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, Michael Marcheschi can be reached on 5712721374. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see http://pair-direct.uspto.gov. Should you have questions on access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /LIBAN M HASSAN/Primary Examiner, Art Unit 1799
Read full office action

Prosecution Timeline

Apr 27, 2023
Application Filed
Nov 04, 2023
Non-Final Rejection — §DP
May 09, 2024
Response Filed
Aug 16, 2024
Final Rejection — §DP
Feb 21, 2025
Request for Continued Examination
Feb 24, 2025
Response after Non-Final Action
May 28, 2025
Non-Final Rejection — §DP
Dec 02, 2025
Response Filed
Dec 24, 2025
Final Rejection — §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12595456
CELL OBSERVATION DEVICE, ELECTROSTIMULATION DEVICE, AND CELL OBSERVATION METHOD
2y 5m to grant Granted Apr 07, 2026
Patent 12589366
Impeller and Sparger Assemblies for a Bioprocessing System
2y 5m to grant Granted Mar 31, 2026
Patent 12584087
BIOLOGICAL CULTURE UNIT
2y 5m to grant Granted Mar 24, 2026
Patent 12559708
CELL COLLECTING DEVICE AND CELL COLLECTING METHOD
2y 5m to grant Granted Feb 24, 2026
Patent 12553017
APPARATUS FOR MICROSCOPIC BIOLOCIGAL ORGANISM OBSERVATION
2y 5m to grant Granted Feb 17, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

AI Strategy Recommendation

Get an AI-powered prosecution strategy using examiner precedents, rejection analysis, and claim mapping.
Powered by AI — typically takes 5-10 seconds

Prosecution Projections

5-6
Expected OA Rounds
50%
Grant Probability
81%
With Interview (+31.3%)
4y 2m
Median Time to Grant
High
PTA Risk
Based on 452 resolved cases by this examiner. Grant probability derived from career allow 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