US2043930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of hydrocyanic acid
Assignee: Shell Development Co
•
Filing: 1933-06-24
•
Granted: 1936-06-09
•
Expires: 1953-06-24
Abstract
No abstract record available.
Inventors
- 👤 Russell W Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:27
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/0208
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) | 1939-06-09 | 1939-12-09 | 1940-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-06-09 | 1943-12-09 | 1944-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-06-09 | 1947-12-09 | 1948-06-09 | $7700.00 | Window Closed / Lapsed |