US3520835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams and their method of preparation using stannous salts of aliphatic acids and beta-hydroxy amines as catalysts
Assignee: Diamond Shamrock Europe Ltd
•
Filing: 1965-03-02
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Granted: 1970-07-21
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Expires: 1985-03-02
Abstract
No abstract record available.
Inventors
- 👤 Edwin Fenton Chandley
- 👤 Hugh Wallis Leigh
- 👤 Arnold John Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/165; C08G18/18; C08G18/1825; C08G18/2805; C08G18/285; C08G18/2875
Claims Analysis
Total Claims: 0
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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) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |