Patent US2572824A successfully refreshed from Google Patents.
US2013222A
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Pressure control apparatus
Assignee: Natural Gas Equipment Inc
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Filing: 1931-06-15
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Granted: 1935-09-03
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Expires: 1951-06-15
Abstract
No abstract record available.
Inventors
- 👤 John V Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:59
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/18; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7287; Y10T137/7313; Y10T137/7323; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777
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) | 1938-09-02 | 1939-03-04 | 1939-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-02 | 1943-03-04 | 1943-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-02 | 1947-03-04 | 1947-09-03 | $7700.00 | Window Closed / Lapsed |