US3509949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excavation of trenches for buried walls
Assignee: Tone Boring Co Ltd
•
Filing: 1967-08-28
•
Granted: 1970-05-05
•
Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 Fukuichi Kukihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:48
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/16; E02; E02D; E02D17/00; E02D17/13; E02F; E02F5/00; E02F5/02; E21B7/00; E21B7/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US305994A
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US458868A
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US836494A
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US861745A
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US890764A
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US2057691A
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US2595126A
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US2605090A
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US2930137A
Cited
US3324959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |