Patent US3388487A successfully refreshed from Google Patents.
US3388487A
Expired / Lapsed
US
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Trenching apparatus
Assignee: Individual
•
Filing: 1965-07-16
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Granted: 1968-06-18
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Expires: 1985-07-16
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:35
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/086; E02F3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1050361A
Cited
US2052372A
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US2549183A
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US2580954A
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US2667709A
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US2817911A
Cited
US3006087A
Cited
US3307276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |