Patent US1875673A successfully refreshed from Google Patents.
US1875673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well control and safety valve mechanism
Assignee: Individual
•
Filing: 1929-10-28
•
Granted: 1932-09-06
•
Expires: 1949-10-28
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Stockstill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:23
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8376
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) | 1935-09-06 | 1936-03-07 | 1936-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-09-06 | 1940-03-07 | 1940-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-09-06 | 1944-03-07 | 1944-09-06 | $7700.00 | Window Closed / Lapsed |