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US2835631A
Expired / Lapsed
US
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Electro-chemical preparation of nitrosoguanidine
Assignee: Individual
•
Filing: 1952-03-21
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Granted: 1958-05-20
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Expires: 1972-03-21
Abstract
No abstract record available.
Inventors
- 👤 Harold F Metcalf
- 👤 Gerald C Whitnack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:50
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/25; C25B3/01; C25B3/07; C25B3/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE167637C
Cited
US2584816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |