Patent US3137671A successfully refreshed from Google Patents.
US3137671A
Expired / Lapsed
US
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Process for the production of colored polyurethane plastics
Assignee: BASF Schweiz AG
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Filing: 1959-03-16
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Granted: 1964-06-16
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Expires: 1979-03-16
Abstract
No abstract record available.
Inventors
- 👤 Bosshard Hans Heinrich
- 👤 Elsener Anton
- 👤 Wirsching Franz
- 👤 Zollinger Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3836
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2225604A
Cited
US2643958A
Cited
GB779077A
Cited
US2894919A
Cited
FR1158250A
Cited
US2986536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |