Patent US3507900A successfully refreshed from Google Patents.
US3507900A
Expired / Lapsed
US
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Process for preparing organic isocyanates
Assignee: Sinclair Research Inc
•
Filing: 1968-03-18
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Granted: 1970-04-21
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Expires: 1988-03-18
Abstract
No abstract record available.
Inventors
- 👤 Emmett H Burk Jr
- 👤 Donald D Carlos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:02
CPC Classifications
C; C07; C07D; C07D291/00; C07D291/02; C07D291/04; C07C; C07C263/00; C07C263/08; C07D273/00; C10; C10B; C10B49/00; C10B49/16; C10B49/20; C10B49/22; C07C2602/00; C07C2602/02; C07C2602/14; C07C2602/26; C07C2602/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2394597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |