Prosecution Insights
Last updated: April 18, 2026
Application No. 18/772,890

REMOVAL OF SULFATE FROM MEG STREAMS USING CALCIUM CHLORIDE

Final Rejection §101§112§DP
Filed
Jul 15, 2024
Examiner
CUTLIFF, YATE KAI RENE
Art Unit
1692
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Cameron International Corporation
OA Round
2 (Final)
80%
Grant Probability
Favorable
3-4
OA Rounds
2y 4m
To Grant
99%
With Interview

Examiner Intelligence

Grants 80% — above average
80%
Career Allow Rate
1023 granted / 1281 resolved
+19.9% vs TC avg
Strong +24% interview lift
Without
With
+24.1%
Interview Lift
resolved cases with interview
Typical timeline
2y 4m
Avg Prosecution
24 currently pending
Career history
1305
Total Applications
across all art units

Statute-Specific Performance

§101
2.6%
-37.4% vs TC avg
§103
37.0%
-3.0% vs TC avg
§102
13.8%
-26.2% vs TC avg
§112
33.6%
-6.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1281 resolved cases

Office Action

§101 §112 §DP
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 . Status of Claims Claims 1 – 20 are pending. Claims 1 – 20 are rejected. Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. Claims 1- 20 are rejected under 35 U.S.C. 112(b), as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor, regards as the invention. Claim 1 recites the expression “divalent treatment… to reduce dissolved divalent cations in the portion of the recycle”, in line 2 – 3. The expression is indefinite and lacks clarity because it is not clear in the claim what is being treated. (see specification paragraph [020]). Claim 6 recites the expression “divalent treatment to reduce dissolved divalent cations in the portion of the recycle”, in line 2 – 3. The expression is indefinite and lacks clarity because it is not clear in the claim what is being treated. (see specification paragraph [020]). Claim 15 recites the expression “divalent treatment unit”, in line 2. The expression is indefinite and lacks clarity because it is not clear in the claim what is being treated within the unit. (see specification paragraph [020]).. Claims 2 – 5, 7 – 14 and 16 – 20 are rejected for being dependent on an indefinite base claim. Double Patenting A rejection based on double patenting of the “same invention” type finds its support in the language of 35 U.S.C. 101 which states that “whoever invents or discovers any new and useful process... may obtain a patent therefor...” (Emphasis added). Thus, the term “same invention,” in this context, means an invention drawn to identical subject matter. See Miller v. Eagle Mfg. Co., 151 U.S. 186 (1894); In re Vogel, 422 F.2d 438, 164 USPQ 619 (CCPA 1970); In re Ockert, 245 F.2d 467, 114 USPQ 330 (CCPA 1957). A statutory type (35 U.S.C. 101) double patenting rejection can be overcome by canceling or amending the claims that are directed to the same invention, so they are no longer coextensive in scope. The filing of a terminal disclaimer cannot overcome a double patenting rejection based upon 35 U.S.C. 101. Claims 1- 20 is/are rejected under 35 U.S.C. 101 as claiming the same invention as that of claims 1-20 of prior U.S. Patent No. 12,037,308 (‘308”). This is a statutory double patenting rejection. Claim 1 of the instantly claimed invention cover inter alia, A method of MEG recovery, comprising: withdrawing a portion of a recycle of a MEG vaporization unit; performing a divalent treatment on the portion of the recycle to reduce dissolved divalent cations in the portion of the recycle; performing a sulfate treatment to reduce dissolved sulfate ions in the portion of the recycle, the sulfate treatment comprising: adding an underdose of one or more calcium halides, one or more lower calcium carboxylates, or a mixture thereof, to a treatment stream; and precipitating calcium sulfate from the treatment stream; performing a solids removal treatment to reduce solids in the portion of the recycle; and returning the portion of the recycle, depleted in divalent cations, sulfate ions, and solids, to the MEG vaporization unit. Claim 1 of ‘308 cover, inter alia, A method of MEG recovery, comprising: withdrawing a portion of a recycle of a MEG vaporization unit; performing a divalent treatment on the portion of the recycle to reduce dissolved divalent cations in the portion of the recycle; performing a sulfate treatment to reduce dissolved sulfate ions in the portion of the recycle, the sulfate treatment comprising: adding an underdose of one or more calcium halides, one or more lower calcium carboxylates, or a mixture thereof, to a treatment stream; and precipitating calcium sulfate from the treatment stream; performing a solids removal treatment to reduce solids in the portion of the recycle; and returning the portion of the recycle, depleted in divalent cations, sulfate ions, and solids, to the MEG vaporization unit. This is a statutory double patenting rejection, and the filing of a terminal disclaimer cannot overcome a double patenting rejection based upon 35 U.S.C. 101. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to YATE' K. CUTLIFF whose telephone number is (571)272-9067. The examiner can normally be reached Monday-Friday (8:30 - 5:30). 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, Scarlett Y. Goon can be reached at (571) 270-5241. 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. /YATE' K CUTLIFF/Primary Examiner, Art Unit 1692
Read full office action

Prosecution Timeline

Jul 15, 2024
Application Filed
Feb 21, 2026
Non-Final Rejection — §101, §112, §DP
Mar 03, 2026
Interview Requested
Mar 09, 2026
Applicant Interview (Telephonic)
Mar 09, 2026
Examiner Interview Summary
Mar 25, 2026
Response Filed
Apr 10, 2026
Final Rejection — §101, §112, §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12594339
LIPID PRODRUGS OF JAK INHIBITORS AND USES THEREOF
2y 5m to grant Granted Apr 07, 2026
Patent 12595223
PROPIONIC ACID PROCESS
2y 5m to grant Granted Apr 07, 2026
Patent 12590053
A PROCESS FOR PREPARING VANILLIN (METH)ACRYLATES
2y 5m to grant Granted Mar 31, 2026
Patent 12590266
Free Polyunsaturated Fatty Acid-Containing Compositions and Manufacturing Method Therefor
2y 5m to grant Granted Mar 31, 2026
Patent 12583810
TRICKLE BED REACTOR
2y 5m to grant Granted Mar 24, 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

3-4
Expected OA Rounds
80%
Grant Probability
99%
With Interview (+24.1%)
2y 4m
Median Time to Grant
Moderate
PTA Risk
Based on 1281 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