Patent US3315528A successfully refreshed from Google Patents.
US3315528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force balance lever transmission with shaft seal
Assignee: Leeds and Northrup Co
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Filing: 1965-02-23
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Granted: 1967-04-25
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Expires: 1985-02-23
Abstract
No abstract record available.
Inventors
- 👤 Richard M Hickox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:47
CPC Classifications
G; G01; G01L; G01L11/00; G01L11/004; G01L11/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A PRESSURE RESPONSIVE MEASURING INSTRUMENT OF THE FORCE BALANCE TYPE, A HOLLOW HOUSING, A FLEXIBLE DIAPHAGM DISPOSED IN SAID HOUSING, A LEVER EXTENDING INTO SAID HOUSING AND CONNECTED AT ONE END TO SAID DIAPHRAGM, LOW FRICTION PIVOT MEANS SUPPORTING SAID LEVER AND PROVIDING A PIVOT THEREFOR EXTERIOR OF SAID HOUSING, AND SEALING MEANS CONNECTING SAID LEVER AND SAID HOUSING TO PREVENT FLOW OF FLUID AROUND SAID LEVER WHILE AVOIDING THE INTRODUCTION OF AN ERROR TORQUE IN THE INSTRUMENT, SAID SEALING MEANS COMPRISING AN O-RING OF ELASTOMER MATERIAL SURROUNDING SAID PIVOTED LEVER AND FORMING A SEAL ON ITS INNER CIRCUMFERENCE WITH SAID LEVER AND ON ITS OUTER CIRCUMFERENCE WITH SAID HOUSING, THE CENTER LINE OF SAID O-RING BEING COMMON TO THE AXIS OF SAID PIVOT MEANS.
Claim 2
Dependent Claim
126 words
IN A PRESSURE RESPONSIVE MEASURING INSTRUMENT OF THE FORCE BALANCE TYPE, A HOLLOW HOUSING, A FLEXIBLE DIAPHAGM DISPOSED IN SAID HOUSING, A LEVER EXTENDING INTO SAID HOUSING AND CONNECTED AT ONE END TO SAID DIAPHRAGM, LOW FRICTION PIVOT MEANS SUPPORTING SAID LEVER AND PROVIDING A PIVOT THEREFOR EXTERIOR OF SAID HOUSING, AND SEALING MEANS CONNECTING SAID LEVER AND SAID HOUSING TO PREVENT FLOW OF FLUID AROUND SAID LEVER WHILE AVOIDING THE INTRODUCTION OF AN ERROR TORQUE IN THE INSTRUMENT, SAID SEALING MEANS COMPRISING AN O-RING OF ELASTOMER MATERIAL SURROUNDING SAID PIVOTED LEVER AND FORMING A SEAL ON ITS INNER CIRCUMFERENCE WITH SAID LEVER AND ON ITS OUTER CIRCUMFERENCE WITH SAID HOUSING, THE CENTER LINE OF SAID O-RING BEING COMMON TO THE AXIS OF SAID PIVOT MEANS.
References Cited (Backward Citations)
US2431200A
Cited
US2690360A
Cited
US2757053A
Cited
US2779197A
Cited
US2995041A
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US3274833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |