US3448140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing urethanes from alcohols and phenols,carbon monoxide and nitro compounds in the presence of transition metal complexes
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1966-03-14
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Granted: 1969-06-03
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Expires: 1986-03-14
Abstract
No abstract record available.
Inventors
- 👤 George Albert Gamlen
- 👤 Arthur Ibbotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:45
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/20; B01J31/24; B01J31/2404; B01J31/2409; B01J2531/00; B01J2531/60; B01J2531/64; B01J2531/80; B01J2531/82; B01J2531/822; B01J2531/827; B01J2531/828; B01J2531/84; B01J2531/845; B01J31/18; B01J31/1895
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3245774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |