US2995196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling head
Assignee: Shaffer Tool Works
•
Filing: 1957-07-08
•
Granted: 1961-08-08
•
Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 Wilfred C Gibson
- 👤 Arthur E Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:46
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B33/085; E21B7/00; E21B7/12; E21B7/128; Y; Y10; Y10S; Y10S425/00; Y10S425/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US939501A
Cited
US1437560A
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US1482856A
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US1587441A
Cited
US1769921A
Cited
US2185822A
Cited
US2199735A
Cited
US2480955A
Cited
US2808230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |