US3302391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal actuators
Assignee: Zurn Industries LLC
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Filing: 1965-01-25
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Granted: 1967-02-07
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Expires: 1985-01-25
Abstract
No abstract record available.
Inventors
- 👤 Ferd P Mihm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/12; G05D23/125; G05D23/02; G05D23/021; G05D23/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A THERMAL ACTUATOR COMPRISING A CLOSED CONTAINER HAVING INNER SURFACES DEFINING A RIGID OPEN-ENDED CYLINDER ACCOMMODATING RECIPROCATIONS OF A PISTON UNIT THEREIN, THERMALLY-RESPONSIVE FILL MATERIAL WITHIN SAID CONTAINER EXHIBITING SIGNIFICANT TEMPERATURE-INDUCED DIMENSIONAL VARIATIONS WITHIN A PREDETERMINED TEMPERATURE RANGE, AND AN ELONGATED PISTON-SEAL UNIT DISPOSED WITHIN SAID CYLINDER AND MOVABLE ALONG THE LONGITUDINAL AXIS THEREOF, SAID PISTON-SEAL UNIT INCLUDING A PISTON MEMBER OF RESILIENT MATERIAL HAVING A CROSS-SECTION NORMALLY NOT IN EXCESS OF THE CROSS-SECTION OF SAID CYLINDER, ELONGATED FASTENING MEANS EXTENDING THROUGH SAID MEMBER IN THE DIRECTION OF SAID AXIS, AND RESILIENT LOADING MEANS MOUNTED ON AND MOVABLE AS A WHOLE WITH SAID FASTENING MEANS IN A FORCETRANSMITTING RELATION TO SAID PISTON MEMBER, SAID FASTENING MEANS INCLUDING AXIALLY-SPACED HOLDING MEANS MOVABLE THEREWITH AXIALLY COMPRESSING SAID PISTON MEMBER AND RESILIENT LOADING MEANS TOGETHER BETWEEN SAID HOLDING MEANS, WHEREBY THE CROSS-SECTION OF SAID AXIALLY-COMPRESSED PISTON MEMBER TENDS TO BE GREATER THAN THAT OF SAID CYLINDER AND FLUID LEAKAGE FROM AND INTO SAID CONTAINER IS SUPPRESSED BY SAID PISTON-SEAL UNIT.
Claim 2
Dependent Claim
167 words
A THERMAL ACTUATOR COMPRISING A CLOSED CONTAINER HAVING INNER SURFACES DEFINING A RIGID OPEN-ENDED CYLINDER ACCOMMODATING RECIPROCATIONS OF A PISTON UNIT THEREIN, THERMALLY-RESPONSIVE FILL MATERIAL WITHIN SAID CONTAINER EXHIBITING SIGNIFICANT TEMPERATURE-INDUCED DIMENSIONAL VARIATIONS WITHIN A PREDETERMINED TEMPERATURE RANGE, AND AN ELONGATED PISTON-SEAL UNIT DISPOSED WITHIN SAID CYLINDER AND MOVABLE ALONG THE LONGITUDINAL AXIS THEREOF, SAID PISTON-SEAL UNIT INCLUDING A PISTON MEMBER OF RESILIENT MATERIAL HAVING A CROSS-SECTION NORMALLY NOT IN EXCESS OF THE CROSS-SECTION OF SAID CYLINDER, ELONGATED FASTENING MEANS EXTENDING THROUGH SAID MEMBER IN THE DIRECTION OF SAID AXIS, AND RESILIENT LOADING MEANS MOUNTED ON AND MOVABLE AS A WHOLE WITH SAID FASTENING MEANS IN A FORCETRANSMITTING RELATION TO SAID PISTON MEMBER, SAID FASTENING MEANS INCLUDING AXIALLY-SPACED HOLDING MEANS MOVABLE THEREWITH AXIALLY COMPRESSING SAID PISTON MEMBER AND RESILIENT LOADING MEANS TOGETHER BETWEEN SAID HOLDING MEANS, WHEREBY THE CROSS-SECTION OF SAID AXIALLY-COMPRESSED PISTON MEMBER TENDS TO BE GREATER THAN THAT OF SAID CYLINDER AND FLUID LEAKAGE FROM AND INTO SAID CONTAINER IS SUPPRESSED BY SAID PISTON-SEAL UNIT.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |