US2620195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for pneumatic columns
Assignee: Independent Pneumatic Tool Co
•
Filing: 1948-11-12
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Granted: 1952-12-02
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Expires: 1968-11-12
Abstract
No abstract record available.
Inventors
- 👤 Hilmer A Gillerstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:18
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/006; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86662; Y10T137/877; Y10T137/87909; Y10T137/87917; Y10T137/88054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US487064A
Cited
US1047499A
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US1231602A
Cited
US1265011A
Cited
US1550550A
Cited
US2401856A
Cited
US2461810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |