Patent US2969800A successfully refreshed from Google Patents.
US2969800A
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Control means and method to maintain predetermined pressure in a pressure zone
Assignee: B H HADLEY Inc
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Filing: 1955-05-31
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Granted: 1961-01-31
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Clifford D Skirvin
- 👤 Weldon B Allbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:00
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/0616; G05D16/0619; F; F02; F02M; F02M21/00; F02M23/00; F02M23/04; F02M23/08; F02M26/00; F02M26/13; F02M26/17; F02M26/21; F02M26/52; F02M26/55; F02M26/58; F02M2700/00; F02M2700/13; F02M2700/1305; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S261/00; Y10S261/19; Y10S55/00; Y10S55/28; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0352; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2572; Y10T137/7722; Y10T137/7748; Y10T137/7752; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7925
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) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |