US2657709A
Expired / Lapsed
US
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Valve
Assignee: Independent Pneumatic Tool Co
•
Filing: 1952-03-25
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Granted: 1953-11-03
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Expires: 1972-03-25
Abstract
No abstract record available.
Inventors
- 👤 Hilmer A Gillerstrom
- 👤 Raleigh O Canning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:19
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/087; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7906; Y10T137/8593; Y10T137/87169; Y10T137/877; Y10T137/87829; Y10T137/87837; Y10T137/87845; Y10T137/87917; Y10T137/87981; Y10T137/88054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |