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US2849866A
Expired / Lapsed
US
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Roof-bolting
Assignee: Individual
•
Filing: 1953-10-14
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Granted: 1958-09-02
•
Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 Flygare Adolf Fredrik
- 👤 Lundkvist Alfred Ingevald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:22
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/02; E21D20/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1345663A
Cited
USRE16062E
Cited
US1798468A
Cited
US2092341A
Cited
US2442113A
Cited
US2677037A
Cited
US2570003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |