US3247172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored copolymers of cyclopentadiene and indole or pyrrole
Assignee: Eastman Kodak Co
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Filing: 1962-09-24
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Granted: 1966-04-19
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Expires: 1982-09-24
Abstract
No abstract record available.
Inventors
- 👤 Jan W H Faber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; C; C08; C08F; C08F232/00; C08F232/08; C08F234/00; C08F236/00; C08F236/02; C08F236/04; G03C1/825; G03C1/835
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A SOLID COPOLYMER CONSISTING ESSENTIALLY OF FROM 20-80% BY WEIGHT OF RECURRING CYCLOPENTADIENE UNITS AND FROM 80-20% BY WEIGHT OF RECURRING UNITS SELECTED FROM THE GROUP CONSISTING OF INDOLE UNITS, PYRROLE UNITS AND A MIXTURE OF INDOLE AND PYRROLE UNITS, THE SAID COPOLYMER BEING IN THE HALIDE SALT FORM AND HAVING A MOLECULAR WEIGHT OF FROM 300 TO 2000.
Claim 2
Dependent Claim
59 words
A SOLID COPOLYMER CONSISTING ESSENTIALLY OF FROM 20-80% BY WEIGHT OF RECURRING CYCLOPENTADIENE UNITS AND FROM 80-20% BY WEIGHT OF RECURRING UNITS SELECTED FROM THE GROUP CONSISTING OF INDOLE UNITS, PYRROLE UNITS AND A MIXTURE OF INDOLE AND PYRROLE UNITS, THE SAID COPOLYMER BEING IN THE HALIDE SALT FORM AND HAVING A MOLECULAR WEIGHT OF FROM 300 TO 2000.
References Cited (Backward Citations)
US2521359A
Cited
US2529316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |