Patent US3962314A successfully refreshed from Google Patents.
US3962314A
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Oxybenzoyl dioxyarylene mono- and diesters
Assignee: Unifrax I LLC
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Filing: 1975-02-28
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Granted: 1976-06-08
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Expires: 1995-02-28
Abstract
Abstract Branched, wholly aromatic polyesters of Formula I ##EQU1## wherein R 1 , R 2 and R 3 each consist essentially of a plurality of moieties selected from the group having the Formulas II, III and IV ##SPC1## and wherein X is -O-, ##EQU2## m is 0 or 1; n is 0 or 1; a is 0-40; b is 0-20; c is 0-20; and a + b + c is 2- 40.
Inventors
- 👤 James Economy
- 👤 Steve C. Cottis
- 👤 Bernard E. Nowak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:44
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G63/68; C08G63/685; C08G63/6852
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A linear polyester of the formula ##SPC22## wherein the indicated bonds on the phenylene nucleus represented by ##SPC23## are meta or para, and R 4 is selected from the group consisting of lower alkanoyl, benzoyl and hydrogen.
Claim 2
Dependent Claim
37 words
A linear polyester of the formula ##SPC22## wherein the indicated bonds on the phenylene nucleus represented by ##SPC23## are meta or para, and R 4 is selected from the group consisting of lower alkanoyl, benzoyl and hydrogen.
Claim 3
Dependent Claim
14 words
A linear polyester as set forth in claim 1 wherein R 4 is hydrogen.
Claim 4
Dependent Claim
39 words
An ester of the formula ##SPC24## wherein the indicated bonds of the phenylene nucleus represented by ##SPC25## are meta or para, and R 4 and R 9 are independently selected from the group consisting of lower alkanoyl and hydrogen.
Claim 5
Dependent Claim
39 words
An ester of the formula ##SPC24## wherein the indicated bonds of the phenylene nucleus represented by ##SPC25## are meta or para, and R 4 and R 9 are independently selected from the group consisting of lower alkanoyl and hydrogen.
Claim 6
Dependent Claim
11 words
An ester according to claim 3 wherein R 4 is hydrogen.
Claim 7
Dependent Claim
11 words
An ester according to claim 4 wherein R 9 is hydrogen.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |