Patent US2250255A successfully refreshed from Google Patents.
US2250255A
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US
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Method of purifying trimethylolnitromethane
Assignee: Hercules Powder Co
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Filing: 1939-10-25
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Granted: 1941-07-22
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Expires: 1959-10-25
Abstract
No abstract record available.
Inventors
- 👤 Richard F B Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:53
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/16; C07C205/00; C07C205/13; C07C205/14; C07C205/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-21 | 1945-01-20 | 1945-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-21 | 1949-01-20 | 1949-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-21 | 1953-01-20 | 1953-07-22 | $7700.00 | Window Closed / Lapsed |