Patent US2673407A successfully refreshed from Google Patents.
US2673407A
Expired / Lapsed
US
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Grave digger
Assignee: Individual
•
Filing: 1950-10-12
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Granted: 1954-03-30
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Expires: 1970-10-12
Abstract
No abstract record available.
Inventors
- 👤 Hugh B Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:06
CPC Classifications
E; E21; E21B; E21B11/00; E21B11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US994380A
Cited
US1071085A
Cited
US1365748A
Cited
US1531755A
Cited
US1866037A
Cited
US2052372A
Cited
US2209732A
Cited
US2381085A
Cited
US2501083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |