US3258971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress-strain gauge
Assignee: Individual
•
Filing: 1962-01-26
•
Granted: 1966-07-05
•
Expires: 1982-01-26
Abstract
No abstract record available.
Inventors
- 👤 Edward D Padgett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:05
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052; G01L9/0055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
APPARATUS FOR MEASURING THE CHANGE IN AN EXTERNAL CONDITION COMPRISING A CONTAINER HAVING AN OPEN END, A FLEXIBLE DIAPHRAGM SECURED OVER AND SEALING AT THE PERIPHERY SAID OPEN END TO PERMIT THE EVACUATION OF AIR WITHIN THE CONTAINER A PIEZO-ELECTRIC CONDITION SENSING ELEMENTL BONDED TO THE INSIDE OF THE FLEXIBLE DIAPHRAGM AND SPACED FROM SAID PERIPHERY THEREOF, A SECOND SENSING ELEMENT OF OPPOSITE POLARITY BONDED IN A CORRESPONDING POSITION ON THE OUTSIDE OF THE DIAPHRAGM, EACH ELEMENT HAVING A PIEZO RESISTANCE VALUE RESPONSIVE TO A CHANGE IN AIR PRESSURE ON RESPECTIVE SIDES OF SAID FLEXIBLE DIAPHRAGM FOR SEPARATE MEASUREMENT OF THE AIR PRESSURE AT EACH ELEMENT, SEPARATE LEAD-OUT WIRES CONNECTED TO EACH SENSING ELEMENT AND ELECTRICAL MEANS CONNECTED TO SAID LEAD-OUT WIRES FOR BALANCING NORMAL ATMOSPHERIC PRESSURE EXERTED ON THE FLEXIBLE DIAPHRAGM AFTER THE CONTAINER HAS BEEN EVACUATED AND FOR MEASURING THEREAFTER THE CHANGE IN EXTERNAL AIR PRESSURE
Claim 2
Dependent Claim
148 words
APPARATUS FOR MEASURING THE CHANGE IN AN EXTERNAL CONDITION COMPRISING A CONTAINER HAVING AN OPEN END, A FLEXIBLE DIAPHRAGM SECURED OVER AND SEALING AT THE PERIPHERY SAID OPEN END TO PERMIT THE EVACUATION OF AIR WITHIN THE CONTAINER A PIEZO-ELECTRIC CONDITION SENSING ELEMENTL BONDED TO THE INSIDE OF THE FLEXIBLE DIAPHRAGM AND SPACED FROM SAID PERIPHERY THEREOF, A SECOND SENSING ELEMENT OF OPPOSITE POLARITY BONDED IN A CORRESPONDING POSITION ON THE OUTSIDE OF THE DIAPHRAGM, EACH ELEMENT HAVING A PIEZO RESISTANCE VALUE RESPONSIVE TO A CHANGE IN AIR PRESSURE ON RESPECTIVE SIDES OF SAID FLEXIBLE DIAPHRAGM FOR SEPARATE MEASUREMENT OF THE AIR PRESSURE AT EACH ELEMENT, SEPARATE LEAD-OUT WIRES CONNECTED TO EACH SENSING ELEMENT AND ELECTRICAL MEANS CONNECTED TO SAID LEAD-OUT WIRES FOR BALANCING NORMAL ATMOSPHERIC PRESSURE EXERTED ON THE FLEXIBLE DIAPHRAGM AFTER THE CONTAINER HAS BEEN EVACUATED AND FOR MEASURING THEREAFTER THE CHANGE IN EXTERNAL AIR PRESSURE
References Cited (Backward Citations)
US1636921A
Cited
US2558563A
Cited
US2894457A
Cited
US2939317A
Cited
US3034345A
Cited
US2979680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |