US3420320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pile driver
Assignee: Marutai Doboku Co Ltd
•
Filing: 1967-02-23
•
Granted: 1969-01-07
•
Expires: 1987-02-23
Abstract
No abstract record available.
Inventors
- 👤 Hiro Washita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:32
CPC Classifications
E; E02; E02D; E02D5/00; E02D5/22; E02D5/34; E02D5/38; E02D5/385; E02D7/00; E02D7/28; E21; E21B; E21B7/00; E21B7/003; E21B7/005; E21B7/006; E21B7/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1787001A
Cited
US1883013A
Cited
US1895901A
Cited
US2007666A
Cited
US2810550A
Cited
US2910274A
Cited
US3106258A
Cited
US3356163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |