US2829502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof bolt installation
Assignee: Individual
•
Filing: 1953-12-17
•
Granted: 1958-04-08
•
Expires: 1973-12-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:34
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/02; Y; Y10; Y10S; Y10S411/00; Y10S411/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1798468A
Cited
US2092341A
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US2302933A
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US2442113A
Cited
US2580414A
Cited
US2690879A
Cited
US2667037A
Cited
US2682152A
Cited
US2666354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |