US3447613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined earth boring and post driving apparatus
Assignee: Individual
•
Filing: 1967-07-07
•
Granted: 1969-06-03
•
Expires: 1987-07-07
Abstract
No abstract record available.
Inventors
- 👤 Edgar J Lisenby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:22
CPC Classifications
E; E02; E02D; E02D7/00; E02D7/26; E02D7/02; E02D7/06; E02D7/08; E02D7/14; E02D7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US753319A
Cited
US1668327A
Cited
US1375066A
Cited
US2107556A
Cited
US2659583A
Cited
US2655006A
Cited
US3356163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |