US2491709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of rubber and plastics in cellular form by means of dinitrosoamino compounds
Assignee: Imperial Chemical Industries Ltd
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Filing: 1945-11-01
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Granted: 1949-12-20
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Expires: 1965-11-01
Abstract
No abstract record available.
Inventors
- 👤 Briggs Arthur Stanley
- 👤 Scharff Godfrey Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/107
Claims Analysis
Total Claims: 0
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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) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |