Patent US1920795A successfully refreshed from Google Patents.
US1920795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydrocyanic acid
Assignee: Selden Co
•
Filing: 1929-09-16
•
Granted: 1933-08-01
•
Expires: 1949-09-16
Abstract
No abstract record available.
Inventors
- 👤 Alphons O Jaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/0208; C01C3/0237; C01C3/0204
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1936-07-31 | 1937-01-30 | 1937-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-07-31 | 1941-01-30 | 1941-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-07-31 | 1945-01-30 | 1945-08-01 | $7700.00 | Window Closed / Lapsed |