US4788276A
Expired / Lapsed
US
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Copolyester carbonate with cycloalkylphenyl end groups
Assignee: General Electric Co
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Filing: 1987-05-20
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Granted: 1988-11-29
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Expires: 2007-05-20
Abstract
Abstract Thermoplastic aromatic polycarbonate containing the polymerized reaction products of (i) at least one dihydric phenol, (ii) a carbonate precursor, and (iii) at least one end-capping agent represented by the formula ##STR1## wherein: R is independently selected from alkyl radicals; Z is a cycloalkyl radical; and n is an integer having a value of from 0 to 4 inclusive.
Inventors
- 👤 Victor Mark, deceased
- 👤 Legal Representatives Ester H. Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:44
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
57 words
An aromatic copolyestercarbonate having an isophthalate group, a terephthalate group, or a mixture of isophthalate and terephthalate groups and containing at least one terminal group represented by the formula ##STR16## wherein R is independently selected from alkyl radicals; Z represents a cycloalkyl radical; and n is an integer having a value of from 0 to 4 inclusive.
Claim 2
Dependent Claim
57 words
An aromatic copolyestercarbonate having an isophthalate group, a terephthalate group, or a mixture of isophthalate and terephthalate groups and containing at least one terminal group represented by the formula ##STR16## wherein R is independently selected from alkyl radicals; Z represents a cycloalkyl radical; and n is an integer having a value of from 0 to 4 inclusive.
Claim 3
Dependent Claim
9 words
The copolyestercarbonate of claim 1 wherein n is zero.
References Cited (Backward Citations)
US4699971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |