US3221703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting variations in pressure
Assignee: TRODYNE CORP
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Filing: 1963-08-06
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Granted: 1965-12-07
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Expires: 1983-08-06
Abstract
No abstract record available.
Inventors
- 👤 Berdj C Kalustyan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:00
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PRESSURE SENSITIVE INSTRUMENT COMPRISING A SEALED RIGID CASING, A SEALED RESILIENTLY EXPANSIBLE CASING MOUNTED IN SAID RIGID CASING, AN INDICATING MEMBER MOUNTED ON SAID EXPANSIBLE CASING FOR LINEAR MOVEMENT THEREBY, SAID RIGID CASING HAVING A WALL PORTION THROUGH WHICH SAID INDICATING MEMBER IS VISIBLE, STOP MEANS IN THE RIGID CASING FOR LIMITING MOVEMENT OF SAID MEMBER IN ONE DIRECTION BY THE EXPANSIBLE CASING RELATIVE TO SAID RIGID CASING, A GASEOUS MEDIUM UNDER A PREDETERMINED OPERATING PRESSURE IN ONE OF SAID CASINGS, AND A GASEOUS MEDIUM UNDER A DIFFERENT SUBSTANTIALLY CONSTANT PREDETERMINED REFERENCE PRESSURE SEALED WITHIN THE OTHER OF SAID CASING, THE NORMAL DIFFERENTIAL BETWEEN SAID PRESSURES BEING SUCH THAT SAID MEMBER IS NORMALLY MAINTAINED AGAINST SAID STOP MEANS WITH SAID EXPANSIBLE CASING BIASED BY ITS RESILIENCY FOR MOVING SAID MEMBER IN THE OTHER DIRECTION UPON A PREDETERMINED REDUCTION OF SAID OPERATING PRESSURE.
Claim 2
Dependent Claim
143 words
A PRESSURE SENSITIVE INSTRUMENT COMPRISING A SEALED RIGID CASING, A SEALED RESILIENTLY EXPANSIBLE CASING MOUNTED IN SAID RIGID CASING, AN INDICATING MEMBER MOUNTED ON SAID EXPANSIBLE CASING FOR LINEAR MOVEMENT THEREBY, SAID RIGID CASING HAVING A WALL PORTION THROUGH WHICH SAID INDICATING MEMBER IS VISIBLE, STOP MEANS IN THE RIGID CASING FOR LIMITING MOVEMENT OF SAID MEMBER IN ONE DIRECTION BY THE EXPANSIBLE CASING RELATIVE TO SAID RIGID CASING, A GASEOUS MEDIUM UNDER A PREDETERMINED OPERATING PRESSURE IN ONE OF SAID CASINGS, AND A GASEOUS MEDIUM UNDER A DIFFERENT SUBSTANTIALLY CONSTANT PREDETERMINED REFERENCE PRESSURE SEALED WITHIN THE OTHER OF SAID CASING, THE NORMAL DIFFERENTIAL BETWEEN SAID PRESSURES BEING SUCH THAT SAID MEMBER IS NORMALLY MAINTAINED AGAINST SAID STOP MEANS WITH SAID EXPANSIBLE CASING BIASED BY ITS RESILIENCY FOR MOVING SAID MEMBER IN THE OTHER DIRECTION UPON A PREDETERMINED REDUCTION OF SAID OPERATING PRESSURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |