US3187065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer comprising alternating polyurethane and polycarbonate groups and process formaking the same
Assignee: Bexford Ltd
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Filing: 1960-09-26
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Granted: 1965-06-01
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Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Mcpherson Norman Spencer
- 👤 Clachan Margaret Loudon
- 👤 Tatehell Keith Reid
- 👤 Abbott Terence Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:30
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3215; C08G18/40; C08G18/42; C08G18/44; C08G18/83; C08G18/831; C08G64/00; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73937
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
38 words
A SYNTHETIC LINEAR POLYMERIC MATERIAL WHICH CONSISTS OF ALTERNATING POLYURETHANE SEQUENCES A HAVING TWO FREE VALENCES AND POLYCARBONATE SEQUENCE B HAVING TWO FREE VALENCES, THE FREE VALENCES OF SAID SEQUENCES BEING SATISFIED WITH THE GROUP OF THE FORMULA:
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) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |