US2915328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bars for supporting the roof in mines and for like purposes
Assignee: HUGH WOOD AND Co Ltd
•
Filing: 1957-07-08
•
Granted: 1959-12-01
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Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 John T Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:27
CPC Classifications
E; E21; E21D; E21D17/00; E21D17/02; E21D17/08; E21D17/086; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32262; Y10T403/32319; Y10T403/32409
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |