Patent US2944432A successfully refreshed from Google Patents.
US2944432A
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US
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Pressure-responsive altitude control device
Assignee: Unisys Corp
•
Filing: 1954-06-21
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Granted: 1960-07-12
•
Expires: 1974-06-21
Abstract
No abstract record available.
Inventors
- 👤 Harry A Rintoul
- 👤 Charles J Cerulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:53
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/042; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18856; Y10T74/18888; Y10T74/1892; Y10T74/18968; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/21; Y10T74/2142; Y10T74/2154; Y10T74/2156; Y10T74/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |