US4167536A
Expired / Lapsed
US
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Organopolysiloxane-phenolphthalein-polycarbonate copolymers
Assignee: General Electric Co
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Filing: 1978-07-21
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Granted: 1979-09-11
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Expires: 1998-07-21
Abstract
Abstract Polymeric compositions containing organosiloxane units, carbonate units and a phenolphthalein nucleus are found to be both thermally processable and possess excellent flame resistance and smoke properties.
Inventors
- 👤 Arnold Factor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:34
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02; C10G59/04; C08; C08G; C08G77/00; C08G77/42; C08G77/448; C08G77/48; C08G77/50; C08G77/52
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
A composition of matter comprising units of the general formula ##STR9## where R is independently selected from the lower alkyl radicals of from 1 to 3 carbon atoms and the phenyl radical, R' is independently selected from H, an alkyl radical having from 1 to 4 carbon atoms inclusive, chlorine, bromine, iodine and nitro, and n and q independently are whole numbers equal to at least 1.
Claim 2
Dependent Claim
67 words
A composition of matter comprising units of the general formula ##STR9## where R is independently selected from the lower alkyl radicals of from 1 to 3 carbon atoms and the phenyl radical, R' is independently selected from H, an alkyl radical having from 1 to 4 carbon atoms inclusive, chlorine, bromine, iodine and nitro, and n and q independently are whole numbers equal to at least 1.
Claim 3
Dependent Claim
23 words
A composition of matter comprising units of the formula ##STR10## where n and q independently are whole numbers equal to at least 1.
Claim 4
Dependent Claim
23 words
A composition of matter comprising units of the formula ##STR10## where n and q independently are whole numbers equal to at least 1.
Claim 5
Dependent Claim
23 words
A composition of matter comprising units of the formula ##STR11## where n and q independently are whole numbers equal to at least 1.
Claim 6
Dependent Claim
23 words
A composition of matter comprising units of the formula ##STR11## where n and q independently are whole numbers equal to at least 1.
Claim 7
Dependent Claim
23 words
A composition of matter comprising units of the formula ##STR12## where n and q independently are whole numbers equal to at least 1.
Claim 8
Dependent Claim
23 words
A composition of matter comprising units of the formula ##STR12## where n and q independently are whole numbers equal to at least 1.
Claim 9
Dependent Claim
25 words
A composition of matter comprising units of the formula ##STR13## where n and q independently are whole numbers equal to or in excess of 1.
Claim 10
Dependent Claim
25 words
A composition of matter comprising units of the formula ##STR13## where n and q independently are whole numbers equal to or in excess of 1.
Claim 11
Dependent Claim
25 words
A composition of matter comprising units of the formula ##STR14## where n and q independently are whole numbers equal to or in excess of 1.
Claim 12
Dependent Claim
25 words
A composition of matter comprising units of the formula ##STR14## where n and q independently are whole numbers equal to or in excess of 1.
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) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |