Patent US2797503A successfully refreshed from Google Patents.
US2797503A
Expired / Lapsed
US
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Trench cutting tool
Assignee: Individual
•
Filing: 1953-07-31
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Granted: 1957-07-02
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Expires: 1973-07-31
Abstract
No abstract record available.
Inventors
- 👤 Penn P Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:13
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/8816; E02D; E02D17/00; E02D17/13; E02D5/00; E02D5/18; E02D5/187; E02F3/90; E02F3/92; E02F3/9212; E02F3/9218; E02F5/00; E02F5/02; E02F5/10; E02F5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |