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Patent US4276233A successfully refreshed from Google Patents.
US4276233A
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US
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Hindered phenol phosphites
Assignee: General Electric Co
•
Filing: 1979-07-16
•
Granted: 1981-06-30
•
Expires: 1999-07-16
Abstract
Abstract Thermally stable polycarbonate compositions are obtained by admixing with a high molecular weight aromatic polycarbonate resin a stabilizing amount of a hindered phenol phosphite.
Inventors
- 👤 Ronald L. Markezich
- 👤 Walter K. Olander
- 👤 Robert J. Axelrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:05
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/145; C08K5/524; C08K5/526
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
87 words
A phosphite compound represented by the general structure: ##STR16## wherein R 1 can independently be an alkyl of about C 1 -C 30 ; and alkyls of C 2 -C 20 which can form cyclic structures; and, A is a hindered phenol represented by the general structure: ##STR17## wherein R 2 , R 3 and R 4 can be the same or different and each can independently be hydrogen, halogen or C 1 -C 4 alkyl provided that neither R 2 and/or R 4 are both hydrogen.
Claim 2
Dependent Claim
87 words
A phosphite compound represented by the general structure: ##STR16## wherein R 1 can independently be an alkyl of about C 1 -C 30 ; and alkyls of C 2 -C 20 which can form cyclic structures; and, A is a hindered phenol represented by the general structure: ##STR17## wherein R 2 , R 3 and R 4 can be the same or different and each can independently be hydrogen, halogen or C 1 -C 4 alkyl provided that neither R 2 and/or R 4 are both hydrogen.
Claim 3
Dependent Claim
7 words
A phosphite compound having the structure: ##STR18##
Claim 4
Dependent Claim
7 words
A phosphite compound having the structure: ##STR18##
Claim 5
Dependent Claim
7 words
A phosphite compound having the structure: ##STR19##
Claim 6
Dependent Claim
7 words
A phosphite compound having the structure: ##STR19##
Claim 7
Dependent Claim
7 words
A phosphite compound having the structure: ##STR20##
Claim 8
Dependent Claim
7 words
A phosphite compound having the structure: ##STR20##
Claim 9
Dependent Claim
7 words
A phosphite compound having the structure: ##STR21##
Claim 10
Dependent Claim
7 words
A phosphite compound having the structure: ##STR21##
Claim 11
Dependent Claim
7 words
A phosphite compound having the structure: ##STR22##
Claim 12
Dependent Claim
7 words
A phosphite compound having the structure: ##STR22##
Claim 13
Dependent Claim
7 words
A phosphite compound having the structure: ##STR23##
Claim 14
Dependent Claim
7 words
A phosphite compound having the structure: ##STR23##
Claim 15
Dependent Claim
7 words
A phosphite compound having the structure: ##STR24##
Claim 16
Dependent Claim
7 words
A phosphite compound having the structure: ##STR24##
Claim 17
Dependent Claim
7 words
A phosphite compound having the structure: ##STR25##
Claim 18
Dependent Claim
7 words
A phosphite compound having the structure: ##STR25##
Claim 19
Dependent Claim
7 words
A phosphite compound having the structure: ##STR26##
Claim 20
Dependent Claim
7 words
A phosphite compound having the structure: ##STR26##
Claim 21
Dependent Claim
7 words
A phosphite compound having the structure: ##STR27##
Claim 22
Dependent Claim
7 words
A phosphite compound having the structure: ##STR27##
Claim 23
Dependent Claim
7 words
A phosphite compound having the structure: ##STR28##
Claim 24
Dependent Claim
7 words
A phosphite compound having the structure: ##STR28##
Claim 25
Dependent Claim
7 words
A phosphite compound having the structure: ##STR29##
Claim 26
Dependent Claim
7 words
A phosphite compound having the structure: ##STR29##
Claim 27
Dependent Claim
7 words
A phosphite compound having the structure: ##STR30##
Claim 28
Dependent Claim
7 words
A phosphite compound having the structure: ##STR30##
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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |