Patent US1850953A successfully refreshed from Google Patents.
US1850953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat, rust, and acid resisting ferrous alloy
Assignee: Individual
•
Filing: 1925-06-19
•
Granted: 1932-03-22
•
Expires: 1945-06-19
Abstract
No abstract record available.
Inventors
- 👤 Percy A E Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:23
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18
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) | 1935-03-22 | 1935-09-21 | 1936-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-22 | 1939-09-21 | 1940-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-22 | 1943-09-21 | 1944-03-22 | $7700.00 | Window Closed / Lapsed |