Patent US3177726A successfully refreshed from Google Patents.
US3177726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition measuring systems
Assignee: Electro Mechanical Research Inc
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Filing: 1962-08-28
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Granted: 1965-04-13
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Expires: 1982-08-28
Abstract
No abstract record available.
Inventors
- 👤 Fisher Sterling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:02
CPC Classifications
G; G01; G01D; G01D3/00; G01D3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A SYSTEM FOR ACCURATELY MEASURING AN UNKNOWN PRESSURE OVER AN EXTENDED RANGE OF VALUES, SAID SYSTEM HAVING A CLOSED LOOP INCLUDING A DIFFERENTIAL PRESSURE TRANSDUCER, A VARIABLE GAIN AMPLIFIER, A FILTERING NETWORK, AND AN ELECTROHYDRAULIC ACTUATOR ARRANGED IN CASCADE; SAID DIFFERENTIAL PRESSURE TRANSDUCER HAVING A FIRST INPUT RESPONSIVE TO SAID UNKNOWN PRESSURE, A SECOND INPUT RESPONSIVE TO THE OUTPUT PRESSURE OF SAID ELECTROHYDRAULIC ACTUATOR, AND PROVIDING AN ELECTRIC SIGNAL TO SAID AMPLIFIER DEPENDENT ON THE DIFFERENCE IN PRESSURE BETWEEN SAID FIRST AND SECOND INPUTS,
Claim 2
Independent Claim
84 words
A SYSTEM FOR ACCURATELY MEASURING AN UNKNOWN PRESSURE OVER AN EXTENDED RANGE OF VALUES, SAID SYSTEM HAVING A CLOSED LOOP INCLUDING A DIFFERENTIAL PRESSURE TRANSDUCER, A VARIABLE GAIN AMPLIFIER, A FILTERING NETWORK, AND AN ELECTROHYDRAULIC ACTUATOR ARRANGED IN CASCADE; SAID DIFFERENTIAL PRESSURE TRANSDUCER HAVING A FIRST INPUT RESPONSIVE TO SAID UNKNOWN PRESSURE, A SECOND INPUT RESPONSIVE TO THE OUTPUT PRESSURE OF SAID ELECTROHYDRAULIC ACTUATOR, AND PROVIDING AN ELECTRIC SIGNAL TO SAID AMPLIFIER DEPENDENT ON THE DIFFERENCE IN PRESSURE BETWEEN SAID FIRST AND SECOND INPUTS,
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |