Patent US2901237A successfully refreshed from Google Patents.
US2901237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring plunger
Assignee: Individual
•
Filing: 1954-05-21
•
Granted: 1959-08-25
•
Expires: 1974-05-21
Abstract
No abstract record available.
Inventors
- 👤 William E Gruer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:33
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/34; B21D45/00; B21D45/003; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/2066; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2135; Y10T83/2163; Y10T83/2166
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1212298A
Cited
US1886740A
Cited
FR752307A
Cited
US2250941A
Cited
US2379528A
Cited
US2690693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |