US3038874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed polycarbonates of bisphenol a and tetrachlorobisphenol a
Assignee: Eastman Kodak Co
•
Filing: 1959-05-25
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Granted: 1962-06-12
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Expires: 1979-05-25
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Laakso
- 👤 David A Buckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:58
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10; C08L; C08L69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AN IMPROVED POLYCARBONATE PREDOMINANTLY OF BISPHENOL A CONSISTING OF A PHYSICAL MIXTURE OF HIGHLY POLYMERIC HOMOPOLYMERS ESSENTIALLY COMPOSED OF: I. FROM 70 TO 80 MOLE PERENT OF A HOMOPOLYMER COMPOSED OF RECURRING UNITS HAVING THE FOLLOWING FORMULA (A):
Claim 2
Dependent Claim
38 words
AN IMPROVED POLYCARBONATE PREDOMINANTLY OF BISPHENOL A CONSISTING OF A PHYSICAL MIXTURE OF HIGHLY POLYMERIC HOMOPOLYMERS ESSENTIALLY COMPOSED OF: I. FROM 70 TO 80 MOLE PERENT OF A HOMOPOLYMER COMPOSED OF RECURRING UNITS HAVING THE FOLLOWING FORMULA (A):
References Cited (Backward Citations)
US2970131A
Cited
US2455652A
Cited
US2789765A
Cited
US2874046A
Cited
US2852378A
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 |