Patent US2214816A successfully refreshed from Google Patents.
Patent US3290922A successfully refreshed from Google Patents.
US3290922A
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Pressure and vacuum determinator
Assignee: TECHRAND CORP OF AMERICA
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Filing: 1964-01-22
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Granted: 1966-12-13
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Expires: 1984-01-22
Abstract
No abstract record available.
Inventors
- 👤 Robert C Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:04
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/40; G01M3/02; G01M3/04; G01M3/24; G01M3/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
APPARATUS FOR DETERMINING THE FLUID PRESURE OF A SPACE ENCLOSED WITHIN AN ENCLOSURE HAVING AT LEAST A FLEXIBLE WALL PORTION COMPRISING: MEANS FOR VIBRATING SAID FLEXIBLE WALL BY FLEXING IT AT A SPECIFIED FREQUENCY; MEANS FOR CONVERTING SOUND WAVES EMITTED BY THE VIBRATING FLEXIBLE WALL INTO ELECTRICAL SIGNALS; AND FREQUENCY CLASSIFICATION MEANS FOR DETERMINING WHETHER THE ELECTRICAL SIGNALS FALL WITHIN A PREDETERMINED FREQUENCY RANGE.
References Cited (Backward Citations)
US2735292A
Cited
US2320390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |