US2602402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine car sealing device
Assignee: Sanford Investment Co
•
Filing: 1947-12-23
•
Granted: 1952-07-08
•
Expires: 1967-12-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh W Sanford
- 👤 Alfred F Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:08
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US987877A
Cited
US973840A
Cited
US1256323A
Cited
US1762667A
Cited
US1851214A
Cited
US1949080A
Cited
US1882186A
Cited
US1918948A
Cited
US1955868A
Cited
US1972431A
Cited
US2237059A
Cited
US2188815A
Cited
US2136687A
Cited
US2189795A
Cited
US2215515A
Cited
US2428731A
Cited
US2443959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |