Patent US4007547A successfully refreshed from Google Patents.
Patent US1751230A successfully refreshed from Google Patents.
US1751230A
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US
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Compressor valve
Assignee: Ingersoll Rand Co
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Filing: 1928-01-21
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Granted: 1930-03-18
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Expires: 1948-01-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:20
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/10; F04B39/106; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7559
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) | 1933-03-17 | 1933-09-16 | 1934-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-03-17 | 1937-09-16 | 1938-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-03-17 | 1941-09-16 | 1942-03-18 | $7700.00 | Window Closed / Lapsed |