US3546331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface crystallization of poly(2,2,4,4-tetramethylcyclobutanediol - 1,3)carbonates by organic solvent/organic nonsolvent liquid solutions
Assignee: Union Carbide Corp
•
Filing: 1967-12-26
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Granted: 1970-12-08
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Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Walter D Niegisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:34
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; C08J2369/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA693056A
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US2336384A
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US3313777A
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US3155756A
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US3214500A
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US3252844A
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US3244789A
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US3327033A
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US3446886A
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US3375210A
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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) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |