Prosecution Insights
Last updated: August 17, 2026
Application No. 18/247,458

POLYESTER COPOLYMER COMPRISING RECYCLED MONOMERS

Final Rejection §102§103
Filed
Mar 31, 2023
Priority
Nov 11, 2020 — RE 10-2020-0150209 +1 more
Examiner
FANG, SHANE
Art Unit
1766
Tech Center
1700 — Chemical & Materials Engineering
Assignee
SK Inc.
OA Round
2 (Final)
76%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
95%
With Interview

Examiner Intelligence

Grants 76% — above average
76%
Career Allowance Rate
1152 granted / 1509 resolved
+11.3% vs TC avg
Strong +19% interview lift
Without
With
+18.8%
Interview Lift
resolved cases with interview
Typical timeline
2y 5m
Avg Prosecution
70 currently pending
Career history
1569
Total Applications
across all art units

Statute-Specific Performance

§101
0.8%
-39.2% vs TC avg
§103
54.6%
+14.6% vs TC avg
§102
19.8%
-20.2% vs TC avg
§112
12.8%
-27.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1509 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 . DETAILED ACTION Response to Amendment The previous 112 rejection has been overcome by the amendment supported by the original disclosure. The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. The previous restriction and 102 rejections have been maintained, but the position has been modified due to the amendment. Claim Rejections - 35 USC § 102 Claim(s) 1-8 is(are) rejected under 35 U.S.C. 102(a)(1) as being anticipated by Tanaka et al. (JP1993186571, machine translation provided). As to claims 1 and 5-7, Tanaka (claims, abs., examples) discloses a process of producing a PET copolymer for molding application (Ex.1, 1, 13, 26) comprising mixing 13.0 kg of terephthalic acid (78.25 mol), 0.27 kg of 1,4-cyclohexanedimethanol (1.87 mol), and 5.82 kg of ethylene glycol (93.76 mol) and 0.30 kg of bis(2-hydroxyethyl) terephthalate. The slurry was then sequentially fed over 4 hours to an esterification tank maintained at 250°C and yield an oligomer. After the esterification reaction, a polycondensation is conducted at temperature from 250°C to 280°C, and the pressure was gradually reduced from atmospheric pressure and maintained at 0.5 mmHg for 2.5 hours. Tanaka further (14) discloses when carried out in multiple stages, the first stage polycondensation (esterification) is usually 250 to 290°C and the pressure is usually 20-500 Torr. Tanaka teaches a process of making and raw materials that are indistinguishable from the process recited in instant pgpub [0033-37]. As to claim 7, the intrinsic viscosity (9,15) of the copolymer obtained from the polycondensation is usually 0.45 to 0.80 dL/g or 0.7 to 1 dL/g, falling within the claimed range. The wt% of bis(2-hydroxyethyl) terephthalate in the aforementioned Tanaka’s polyester copolymer is 2% by calculation, falling with the range (1%-92%) of instant Ex.2-1 to 2-10 (instant Table 2). The wt% of bis(2-hydroxyethyl) terephthalate appears to be critical to the claimed property of equation 1, A, B, and YID as recited in claim 1. The mol% of ethylene glycol of the total diols in the aforementioned Tanaka’s polyester copolymer is 98% by calculation, falling within the range of instant [0020]. The limitation of “recycled BHET” and its properties of equation 1, A, B, and YID in claim 1 are product-by-process limitations. Thus, Claim 1-8 are product-by-process claims that are limited by and defined by the product. Determination of patentability is based on the product itself, not on its method of production. If the product in the product-by-process claim is the same as or obvious from a product of the prior art, the claim is unpatentable even though the prior product was made by a different process. In re Thorpe, 777 F. 2d 695, 698,277 USPQ 964,966 (Fed. Cir. 1985). See MPEP § 2113. In this case, the aforementioned Tanaka’s polyester copolymer shows no structural difference from the claimed ones. In light of this, one of ordinary skill in the art would at once envisage the aforementioned Tanaka’s polyester copolymer would inherently exhibit the claimed Hunter values of claim 8, because in view of the substantially identical composition (in this case, the disclosed polyester copolymer structure) and process of producing thereof, it appears that the adduct would have inherently possessed the claimed properties. See MPEP § 2112. Response to Arguments The argument for allowance of amended claims has been fully considered but not persuasive. The applicant attacked Tanaka for not teaching the claimed equation 1, A, B, and YID, properties of “recycled BHET” that is a product-by-process limitation. Determination of patentability is based on the product itself, not on its method of production. If the product in the product-by-process claim is the same as or obvious from a product of the prior art, the claim is unpatentable even though the prior product was made by a different process. In re Thorpe, 777 F. 2d 695, 698,277 USPQ 964,966 (Fed. Cir. 1985). See MPEP § 2113. In this case, the aforementioned Tanaka’s polyester copolymer shows no structural difference from the claimed ones. Since the PTO does not have proper means to conduct experiments, the burden of proof is now shifted to applicants to show otherwise. A case indicating that the burden of proof can be shifted to the applicant to show that the subject matter of the prior art does not possess the characteristic relied on whether the rejection is based on inherency under 35 U.S.C. 102 or obviousness under 35 U.S.C. 103. See MPEP § 2184. In re Fitzgerald, 619 F.2d 67, 205 USPQ 594 (CCPA 1980). Therefore, the previous restriction and 102 rejections have been maintained, but the position has been modified due to the amendment. 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 extension fee 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 date of this final action. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to SHANE FANG whose telephone number is (571)270-7378. The examiner can normally be reached on Mon-Thurs. 8am-6pm. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Randy Gulakowski can be reached on 571.572.1302. 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. /SHANE FANG/Primary Examiner, Art Unit 1766
Read full office action

Prosecution Timeline

Mar 31, 2023
Application Filed
Feb 10, 2026
Non-Final Rejection mailed — §102, §103
Jun 09, 2026
Response Filed
Jun 29, 2026
Final Rejection mailed — §102, §103 (current)

Precedent Cases

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
76%
Grant Probability
95%
With Interview (+18.8%)
2y 5m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1509 resolved cases by this examiner. Grant probability derived from career allowance rate.

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