Patent US551044A successfully refreshed from Google Patents.
Patent US3038879A successfully refreshed from Google Patents.
US3038879A
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Block copolycarbonates from tetrachlorobisphenol a and 4, 4'-bis(hydroxyphenyl)-naphthyl methanes
Assignee: Eastman Kodak Co
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Filing: 1959-07-17
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Granted: 1962-06-12
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Expires: 1979-07-17
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Laakso
- 👤 David A Buckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:26
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10; C08G64/18; G; G03; G03C; G03C1/00; G03C1/76; G03C1/795
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
AN IMPROVED POLYCARBON OF 2,2-BIS(3,5-DICHLORO4-HYDROXYPHENYL)PROPANE CONSISTING OF A HIGHLY POLYMERIC BLOCK COPOLYMER HAVING AN INHERENT VISCOSITY OF FROM ABOUT 0.5 TO ABOUT 3.5 ESSENTIALLY COMPOSED OF ALTERNATING BLOCKS HAVING THE STRUCTURES:
Claim 2
Dependent Claim
31 words
AN IMPROVED POLYCARBON OF 2,2-BIS(3,5-DICHLORO4-HYDROXYPHENYL)PROPANE CONSISTING OF A HIGHLY POLYMERIC BLOCK COPOLYMER HAVING AN INHERENT VISCOSITY OF FROM ABOUT 0.5 TO ABOUT 3.5 ESSENTIALLY COMPOSED OF ALTERNATING BLOCKS HAVING THE STRUCTURES:
Claim 3
Dependent Claim
39 words
BLOCKS CHARACTERIZED IN THAT THESE BLOCKS AS AN INDEPENDENT POLYMER WOULD HAVE AN INEHERENT VISCOSITY OF AT LEAST 0.05 MEASURED IN CHLOROFORM AND BE COMPOSED OF FROM ABOUT 3 TO ABOUT 50 RECURRING UNITS HAVING THE FOLLOWING FORMULA A:
Claim 4
Dependent Claim
39 words
BLOCKS CHARACTERIZED IN THAT THESE BLOCKS AS AN INDEPENDENT POLYMER WOULD HAVE AN INEHERENT VISCOSITY OF AT LEAST 0.05 MEASURED IN CHLOROFORM AND BE COMPOSED OF FROM ABOUT 3 TO ABOUT 50 RECURRING UNITS HAVING THE FOLLOWING FORMULA A:
References Cited (Backward Citations)
CA578585A
Cited
US2970131A
Cited
US2698241A
Cited
US2843567A
Cited
US2874046A
Cited
US2799666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |