Patent US1902731A successfully refreshed from Google Patents.
US1902731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking cover
Assignee: Individual
•
Filing: 1930-11-15
•
Granted: 1933-03-21
•
Expires: 1950-11-15
Abstract
No abstract record available.
Inventors
- 👤 Warren S Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:39
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; E02D29/1427; Y; Y10; Y10S; Y10S70/00; Y10S70/34; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/1006; Y10T292/1007; Y10T292/101; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5522; Y10T70/554; Y10T70/5562; Y10T70/5575; Y10T70/558; Y10T70/5589
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) | 1936-03-20 | 1936-09-19 | 1937-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-20 | 1940-09-19 | 1941-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-20 | 1944-09-19 | 1945-03-21 | $7700.00 | Window Closed / Lapsed |