Patent US2500785A successfully refreshed from Google Patents.
US2500785A
Expired / Lapsed
US
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Side drill with slotted guide tube
Assignee: Individual
•
Filing: 1946-07-08
•
Granted: 1950-03-14
•
Expires: 1966-07-08
Abstract
No abstract record available.
Inventors
- 👤 Arutunoff Armais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:50
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1271904A
Cited
US1595922A
Cited
US1804819A
Cited
US1850403A
Cited
US2136152A
Cited
US2252620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |