Patent US3342959A successfully refreshed from Google Patents.
US3342959A
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Differential pressure switch
Assignee: Universal Oil Products Co
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Filing: 1965-12-08
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Granted: 1967-09-19
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Expires: 1985-12-08
Abstract
No abstract record available.
Inventors
- 👤 Theodore R Breunich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/38; H01H35/247
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A DIFFERENTIAL PRESSURE SWITCH PROVIDING AN OPEN CIRCUIT FOR PRESSURES ABOVE AND BELOW A PREDETERMINED DIFFERENTIAL RANGE, WHICH COMPRISES IN COMBINATION, (A) A CONFINED TUBULAR FORM PRESSURE TIGHT HOUSING WITH A FLUID INLET AT ONE END THEREOF AND A FLUID OUTLET FROM THE OPPOSING END PORTION THEREOF, (B) A MOVABLE PISTON MEMBER POSITIONED IN SAID HOUSING IN A MANNER HAVING ITS SOLID TRANSVERSE END PORTION ADJACENT THE FLUID INLET AND END OF THE HOUSING, IN ADDITION SAID PISTON MEMBER HAVING AN OUTER PERIPHERAL WALL SECTON AND A CONCENTRIC SPACED APART OPEN INNER CORE SECTION, (C) A RING-SHAPED INTERMEDIATE SPRING HOLDING MEMBER THAT IS LONGITUDINALLY MOVABLE IN A POSITION BETWEEN SAID OUTER WALL SECTION AND SAID INNER CORE SECTION OF SAID PISTION MEMBER, (D) SAID SPRING HOLDING MEMBER HAVING AN OUTWARDLY PROJECTING FLANGE SECTION PROVIDING SUPPORT FOR A LOW PRESSURE RANGE COMPRESSION SPRING POSITIONED THEREBETWEEN AND THE INTERIOR OF SAID TRANSVERSE END PORTION OF SAID PISTON MEMBER, (E) SAID SPRING HOLDING MEMBER ALSO HAVING AN INWARDLY PROJECTING FLANGE SECTION SUPPORTING A HIGH PRESSURE RANGE SPRING THEREBETWEEN AND A DOWNSTREAM INTERIOR END PORTION OF THE HOUSING,
Claim 2
Dependent Claim
184 words
A DIFFERENTIAL PRESSURE SWITCH PROVIDING AN OPEN CIRCUIT FOR PRESSURES ABOVE AND BELOW A PREDETERMINED DIFFERENTIAL RANGE, WHICH COMPRISES IN COMBINATION, (A) A CONFINED TUBULAR FORM PRESSURE TIGHT HOUSING WITH A FLUID INLET AT ONE END THEREOF AND A FLUID OUTLET FROM THE OPPOSING END PORTION THEREOF, (B) A MOVABLE PISTON MEMBER POSITIONED IN SAID HOUSING IN A MANNER HAVING ITS SOLID TRANSVERSE END PORTION ADJACENT THE FLUID INLET AND END OF THE HOUSING, IN ADDITION SAID PISTON MEMBER HAVING AN OUTER PERIPHERAL WALL SECTON AND A CONCENTRIC SPACED APART OPEN INNER CORE SECTION, (C) A RING-SHAPED INTERMEDIATE SPRING HOLDING MEMBER THAT IS LONGITUDINALLY MOVABLE IN A POSITION BETWEEN SAID OUTER WALL SECTION AND SAID INNER CORE SECTION OF SAID PISTION MEMBER, (D) SAID SPRING HOLDING MEMBER HAVING AN OUTWARDLY PROJECTING FLANGE SECTION PROVIDING SUPPORT FOR A LOW PRESSURE RANGE COMPRESSION SPRING POSITIONED THEREBETWEEN AND THE INTERIOR OF SAID TRANSVERSE END PORTION OF SAID PISTON MEMBER, (E) SAID SPRING HOLDING MEMBER ALSO HAVING AN INWARDLY PROJECTING FLANGE SECTION SUPPORTING A HIGH PRESSURE RANGE SPRING THEREBETWEEN AND A DOWNSTREAM INTERIOR END PORTION OF THE HOUSING,
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |