Patent US3274156A successfully refreshed from Google Patents.
US3274156A
Expired / Lapsed
US
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Chlorinated polycarbonates
Assignee: Eastman Kodak Co
•
Filing: 1964-01-10
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Granted: 1966-09-20
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Expires: 1984-01-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Perry
- 👤 Jr Winston J Jackson
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:29
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/42; C08G64/04; C08G64/06; C08G64/08; C08G64/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
7 words
A POLYCARBONATE HAVING THE RECURRING STRUCTURAL UNIT
Claim 2
Dependent Claim
7 words
A POLYCARBONATE HAVING THE RECURRING STRUCTURAL UNIT
Claim 3
Dependent Claim
23 words
THE PROCESS FOR PREPARING THE POLYMERS OF CLAIM 1 COMPRISING INTRODUCING CHLORINE INTO A SOLUTION OF A POLYCARBONATE HAVING THE RECURRING STRUCTURAL UNIT
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |