Patent US3713157A successfully refreshed from Google Patents.
Patent US3254047A successfully refreshed from Google Patents.
US3254047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additives for increasing modulus of elasticity of polycarbonate films
Assignee: Eastman Kodak Co
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Filing: 1961-09-14
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Granted: 1966-05-31
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Expires: 1981-09-14
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 Jr Winston J Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08L; C08L67/00; C08L67/02; C08L69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A COMPOSITON CONSISTING ESSENTIALLY OF FROM 90 TO 60 WEIGHT PERCENT OF A THERMOPLASTIC POLYCARBONATE OF A BISPHENOL AND FROM 10 TO 40 WEIGHT PERCENT OF A POLYSTYRENE GLYCOL STIFFNESS IMPROVING ADDITIVE HAVING A MOLECULAR WEIGHT FROM 378 TO 3,000.
Claim 2
Dependent Claim
40 words
A COMPOSITON CONSISTING ESSENTIALLY OF FROM 90 TO 60 WEIGHT PERCENT OF A THERMOPLASTIC POLYCARBONATE OF A BISPHENOL AND FROM 10 TO 40 WEIGHT PERCENT OF A POLYSTYRENE GLYCOL STIFFNESS IMPROVING ADDITIVE HAVING A MOLECULAR WEIGHT FROM 378 TO 3,000.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |