Patent US2743950A successfully refreshed from Google Patents.
US2743950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: National Motor Bearing Co Inc
•
Filing: 1951-07-12
•
Granted: 1956-05-01
•
Expires: 1971-07-12
Abstract
No abstract record available.
Inventors
- 👤 Fred A Helfrecht
- 👤 Voorhees Vanderveer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:54
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/78; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/322
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2196337A
Cited
US2181203A
Cited
FR877957A
Cited
FR876866A
Cited
US2358536A
Cited
US2598094A
Cited
US2488465A
Cited
US2482029A
Cited
US2574062A
Cited
US2542141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |