Patent US2702180A successfully refreshed from Google Patents.
US2702180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of excavation
Assignee: Individual
•
Filing: 1951-08-10
•
Granted: 1955-02-15
•
Expires: 1971-08-10
Abstract
No abstract record available.
Inventors
- 👤 William M Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:25
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1346939A
Cited
US2126576A
Cited
US2122099A
Cited
US2234451A
Cited
US2514585A
Cited
US2693345A
Cited
US2664273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |