Patent US3128264A successfully refreshed from Google Patents.
US3128264A
Expired / Lapsed
US
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Block copolycarbonates of bisphenol a and 4,4'-bis(hydroxyphenyl) diphenyl methane
Assignee: Eastman Kodak Co
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Filing: 1959-07-17
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Granted: 1964-04-07
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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 05:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; C; C08; C08G; C08G64/00; C08G64/04; C08G64/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
AN IMPROVED POLYCARBONATE OF 2,2-BIS(4-HYDROXYPHENYL)PROPANE CONSISTING OF A HIGHLY POLYMERIC BLOCK COPOLYMER HAVING AN INHERENT VISCOSITY OF FROM ABOUT 0.4 TO ABOUT 3.5 ESSENTIALLY COMPOSED OF ALTERNATING BLOCKS HAVING THE STRUCTURES: I. BLOCKS CHARACTERIZED IN THAT THESE BLOCKS AS AN INDEPENDENT POLYMER WOULD HAVE AN INHERENT 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 2
Dependent Claim
71 words
AN IMPROVED POLYCARBONATE OF 2,2-BIS(4-HYDROXYPHENYL)PROPANE CONSISTING OF A HIGHLY POLYMERIC BLOCK COPOLYMER HAVING AN INHERENT VISCOSITY OF FROM ABOUT 0.4 TO ABOUT 3.5 ESSENTIALLY COMPOSED OF ALTERNATING BLOCKS HAVING THE STRUCTURES: I. BLOCKS CHARACTERIZED IN THAT THESE BLOCKS AS AN INDEPENDENT POLYMER WOULD HAVE AN INHERENT 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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |