Patent US3003423A successfully refreshed from Google Patents.
US3003423A
Expired / Lapsed
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Pressure control valve
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1957-07-11
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Granted: 1961-10-10
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Expires: 1977-07-11
Abstract
No abstract record available.
Inventors
- 👤 Gilbert H Drutchas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:01
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/24; F04C14/26; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/044; F16K47/00; F16K47/01; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/785; Y10T137/7904; Y10T137/7922; Y10T137/7927; Y10T137/7928
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |