US2689718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral seam sawing apparatus
Assignee: Individual
•
Filing: 1951-04-17
•
Granted: 1954-09-21
•
Expires: 1971-04-17
Abstract
No abstract record available.
Inventors
- 👤 Alvah J W Headlee
- 👤 Richard G Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:40
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/04; B28D1/045; B23; B23D; B23D45/00; B23D45/02; B23D45/021; B23D45/022; Y; Y10; Y10T; Y10T83/00; Y10T83/768; Y10T83/7684; Y10T83/7722
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |