US4312803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable polycarbonate compositions
Assignee: General Electric Co
•
Filing: 1979-03-16
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Granted: 1982-01-26
•
Expires: 1999-03-16
Abstract
Abstract Thermally stable polycarbonate compositions are obtained by admixing with a high molecular weight aromatic polycarbonate resin a stabilizing amount of a bisphosphite.
Inventors
- 👤 Ronald L. Markezich
- 👤 Gary L. Freimiller
- 👤 Walter K. Olander
- 👤 Robert J. Axelrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65746; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
A bisphosphite having the stucture: ##STR5##
Claim 2
Dependent Claim
6 words
A bisphosphite having the stucture: ##STR5##
Claim 3
Dependent Claim
46 words
A thermally stable aromatic polycarbonate composition comprising an admixture of (1) polymer consisting essentially of a high molecular weight aromatic polycarbonate and (2) a thermal stabilizing amount of about 0.005-1.0 weight percent based upon the weight of the polycarbonate of a bisphosphite having the structure: ##STR6##
Claim 4
Dependent Claim
46 words
A thermally stable aromatic polycarbonate composition comprising an admixture of (1) polymer consisting essentially of a high molecular weight aromatic polycarbonate and (2) a thermal stabilizing amount of about 0.005-1.0 weight percent based upon the weight of the polycarbonate of a bisphosphite having the structure: ##STR6##
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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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |