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Patent US4412060A successfully refreshed from Google Patents.
US4412060A
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Cycloalkyl carbonyl end-capped aromatic polycarbonates
Assignee: General Electric Co
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Filing: 1982-06-09
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Granted: 1983-10-25
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Expires: 2002-06-09
Abstract
Abstract Aromatic polycarbonate chain terminated with a cyclic ester.
Inventors
- 👤 Niles R. Rosenquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:12
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
An aromatic polycarbonate chain terminated with a residue having a structure of the Formula ##STR9## wherein R is cycloalkyl of four to seven ring carbon atoms, inclusive, or methyl substituted cycloalkyl of four to seven ring carbon atoms, inclusive, wherein from one to three hydrogen atoms of the cycloalkyl group are replaced by a methyl group.
Claim 2
Dependent Claim
56 words
An aromatic polycarbonate chain terminated with a residue having a structure of the Formula ##STR9## wherein R is cycloalkyl of four to seven ring carbon atoms, inclusive, or methyl substituted cycloalkyl of four to seven ring carbon atoms, inclusive, wherein from one to three hydrogen atoms of the cycloalkyl group are replaced by a methyl group.
Claim 3
Dependent Claim
26 words
A polycarbonate in accordance with claim 1 wherein R is cycloalkyl of four ring carbon atoms or methyl substituted cyclo alkyl of four ring carbon atoms.
Claim 4
Dependent Claim
16 words
A polycarbonate in accordance with claim 2 wherein R is cycloalkyl of four ring carbon atoms.
Claim 5
Dependent Claim
31 words
A polycarbonate in accordance with claim 1 wherein R is cycloalkyl of five to seven ring carbon atoms, inclusive, or methyl substituted cycloalkyl of five to seven ring carbon atoms inclusive.
Claim 6
Dependent Claim
16 words
A polycarbonate in accordance with claim 4 wherein R is cycloalkyl of five ring carbon atoms.
Claim 7
Dependent Claim
16 words
A polycarbonate in accordance with claim 4 wherein R is cycloalkyl of six ring carbon atoms.
Claim 8
Dependent Claim
16 words
A polycarbonate in accordance with claim 4 wherein R is cycloalkyl of seven ring carbon atoms.
Claim 9
Dependent Claim
23 words
A polycarbonate in accordance with claims 3, 5, 6 or 7 wherein the aromatic polycarbonate is derived from bisphenol-A and a carbonate precursor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |