US2959922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic supports
Assignee: Mastabar Mining Equipment Co Ltd
•
Filing: 1958-07-28
•
Granted: 1960-11-15
•
Expires: 1978-07-28
Abstract
No abstract record available.
Inventors
- 👤 Tebb Bernard
- 👤 Perry Clarence Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:28
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/50; E21D15/54; E21D15/55; E21D15/14; E21D15/44; E21D15/45; F; F16; F16P; F16P7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |