US3319155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical calibration device for strain gage bridges
Assignee: Emerson Process Management Ltd
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Filing: 1964-11-30
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Granted: 1967-05-09
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Expires: 1984-11-30
Abstract
No abstract record available.
Inventors
- 👤 Robert R Kooiman
- 👤 Earl A Grindheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:00
CPC Classifications
G; G01; G01L; G01L25/00; G01L1/00; G01L1/20; G01L1/22; G01L1/2268
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
AN ELECTRICAL CALIBRATION DEVICE COMPRISING A RESISTANCE BRIDGE HAVING FOUR RESISTANCE ARMS WHEREIN THE RESISTANCE OF AT LEAST A FIRST OF SAID ARMS CHANGES IN RESPONSE TO A CHANGE IN A PHYSICAL PARAMETER WHICH IS TO BE MEASURED, MEANS TO PROVIDE A BRIDGE EXCITATION VOLTAGE SUPPLY, MEANS TO INDICATE UNBALANCE OF THE BRIDGE, SWITCHING MEANS MOVABLE TO OPEN OR CLOSE AN ELECTRIC CIRCUIT CONNECTED THERETHROUGH, A FIRST RESISTANCE AND A SECOND RESISTANCE SEPARATE FROM THE RESISTANCE ARMS, SAID FIRST AND SECOND RESISTANCES HAVING A KNOWN RATIO OF RESISTANCE,
Claim 2
Dependent Claim
88 words
AN ELECTRICAL CALIBRATION DEVICE COMPRISING A RESISTANCE BRIDGE HAVING FOUR RESISTANCE ARMS WHEREIN THE RESISTANCE OF AT LEAST A FIRST OF SAID ARMS CHANGES IN RESPONSE TO A CHANGE IN A PHYSICAL PARAMETER WHICH IS TO BE MEASURED, MEANS TO PROVIDE A BRIDGE EXCITATION VOLTAGE SUPPLY, MEANS TO INDICATE UNBALANCE OF THE BRIDGE, SWITCHING MEANS MOVABLE TO OPEN OR CLOSE AN ELECTRIC CIRCUIT CONNECTED THERETHROUGH, A FIRST RESISTANCE AND A SECOND RESISTANCE SEPARATE FROM THE RESISTANCE ARMS, SAID FIRST AND SECOND RESISTANCES HAVING A KNOWN RATIO OF RESISTANCE,
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) | 1970-05-08 | 1970-11-07 | 1971-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-08 | 1974-11-07 | 1975-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-08 | 1978-11-07 | 1979-05-09 | $7700.00 | Window Closed / Lapsed |