US2660403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Posthole forming machine
Assignee: W E WILLIAMS
•
Filing: 1950-05-02
•
Granted: 1953-11-24
•
Expires: 1970-05-02
Abstract
No abstract record available.
Inventors
- 👤 Frank E Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:59
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US51217A
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US529293A
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US1263661A
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US1774884A
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US1866943A
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US2036355A
Cited
US2122686A
Cited
US2398512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |