Patent US2959615A successfully refreshed from Google Patents.
US2959615A
Expired / Lapsed
US
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Preparation of substituted semicarbazides
Assignee: Millennium Petrochemicals Inc
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Filing: 1957-10-09
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Granted: 1960-11-08
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Expires: 1977-10-09
Abstract
No abstract record available.
Inventors
- 👤 David W Lum
- 👤 Irving L Mador
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:33
CPC Classifications
C; C07; C07C; C07C281/00; C07C281/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A METHOD FOR PREPARING A SEMICARBAZIDE WHICH COMPRISES HYDROGENATING A SUBSTITUTED NITROSO UREA HAVING THE FORMULA
Claim 2
Independent Claim
16 words
A METHOD FOR PREPARING A SEMICARBAZIDE WHICH COMPRISES HYDROGENATING A SUBSTITUTED NITROSO UREA HAVING THE FORMULA
References Cited (Backward Citations)
US2717200A
Cited
US2749217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |