Patent US3559488A successfully refreshed from Google Patents.
US3559488A
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Differential pressure measuring apparatus
Assignee: Honeywell Inc
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Filing: 1969-08-20
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Granted: 1971-02-02
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Expires: 1989-08-20
Abstract
Abstract AN EXTREMELY SENSITIVE DIFFERENTIAL PRESSURE TO CURRENT TRANSUCER EMPLOYING: (1) A UNITARY RIGID DISC AND A THIN PRESSURE SENSING MEMBRANE FOR THE CLOSED END PORTION OF A BELLOWS THAT HAS AN OPEN END MOUNTED ON A STATIONARY WALL? (2) AN OVERLOAD VALVE TO PROTECT THE MEMBRANE AGAINST RUPTURE BY THE SEPARATE FLUID PRESSURES ACTING ON THE INTERNAL AND EXTERNAL SURFACE OF THE BELLOWS? AND WHEREIN (3) THE OVERLOAD VALVE IS MOUNTED FOR MOVEMENT WITH THE DISC AND INTO SEALED ENGAGEMENT WITH ONE OR THE OTHER OF OPPOSITE SIDES WALL SURFACES OF THE STATIONARY WALL.
Inventors
- 👤 John A Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:11
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/06; G01L19/0618; G01L13/00; G01L13/02; G01L13/025; G01L19/0627; G01L19/0645; G01L19/14; G01L19/145; G01L19/146; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |