US3478640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof bolt connection
Assignee: Individual
•
Filing: 1968-02-19
•
Granted: 1969-11-18
•
Expires: 1988-02-19
Abstract
No abstract record available.
Inventors
- 👤 Gerald W Elders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:50
CPC Classifications
F; F16; F16B; F16B35/00; F16B35/04; F16B35/041; E; E21; E21D; E21D21/00; E21D21/0026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE536820A
Cited
DE1072942B
Cited
GB190521852A
Cited
US1618239A
Cited
GB809987A
Cited
GB853206A
Cited
US3391720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |