US2581258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driller
Assignee: Ex-Cell-O Corp
•
Filing: 1943-08-12
•
Granted: 1952-01-01
•
Expires: 1963-08-12
Abstract
No abstract record available.
Inventors
- 👤 John W Karweit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:52
CPC Classifications
B; B23; B23B; B23B43/00; B23B43/02; B23B47/00; B23B47/34; Y; Y10; Y10T; Y10T408/00; Y10T408/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US378344A
Cited
US463973A
Cited
US673533A
Cited
US968718A
Cited
US2092755A
Cited
US2195052A
Cited
US2276611A
Cited
US2328542A
Cited
US2308990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |