US2297942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step valve for compressors
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1941-03-28
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Granted: 1942-10-06
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Expires: 1961-03-28
Abstract
No abstract record available.
Inventors
- 👤 Lester L Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:11
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/08; F04; F04B; F04B39/00; F04B39/10; F04B39/102; F04B39/1033; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7559; Y10T137/7668
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-10-05 | 1946-04-06 | 1946-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-05 | 1950-04-06 | 1950-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-05 | 1954-04-06 | 1954-10-06 | $7700.00 | Window Closed / Lapsed |