US3106546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers of polycarbonates from bisphenol a and 4, 4'-bis (hydroxyphenyl) naphthylmethanes, the latter compounds per se and homopolymers thereof
Assignee: Eastman Kodak Co
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Filing: 1959-07-17
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Granted: 1963-10-08
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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
2026-10-25 08:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; 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:
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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) | 1966-10-07 | 1967-04-08 | 1967-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-07 | 1971-04-08 | 1971-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-07 | 1975-04-08 | 1975-10-08 | $7700.00 | Window Closed / Lapsed |