US2947279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof bolt and bolting system
Assignee: MSA Safety Inc
•
Filing: 1957-11-22
•
Granted: 1960-08-02
•
Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Edward J Hohos
- 👤 James A Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:18
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/0093; Y; Y10; Y10S; Y10S116/00; Y10S116/34; Y10S116/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US200104A
Cited
US869443A
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US2085074A
Cited
US2725843A
Cited
US2747454A
Cited
US2740315A
Cited
GB748969A
Cited
FR1119434A
Cited
US2804798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |