US3256398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive limit control with range and differential spring adjustments
Assignee: Robertshaw Controls Co
•
Filing: 1963-07-24
•
Granted: 1966-06-14
•
Expires: 1983-07-24
Abstract
No abstract record available.
Inventors
- 👤 Harold F Snider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/0616; G05D16/0625; H01H35/2607; H01H35/2614
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PRESSURE RESPONSIVE CONTROL DEVICE COMPRISING A HOUSING FRAME, AN OPERATING LEVER PIVOTALLY MOUNTED ON SAID FRAME, PRESSURE RESPONSIVE MEANS INCLUDING A POWER ELEMENT MOUNTED ON SAID FRAME ABOVE SAID LEVER FOR ENGAGEMENT THEREWITH, A RANGE SPRING HAVING ONE END CONNECTED TO SAID LEVER, A SPRING NUT CONNECTED TO AN OPPOSITE END OF SAID RANGE SPRING, A RANGE ADJUSTMENT SCREW CARRIED BY SAID FRAME AND CONNECTED TO SAID SPRING NUT FOR ADJUSTING SAID RANGE SPRING, SWITCH MEANS CARRIED BY SAID HOUSING BELOW SAID LEVER FOR ACTUATION THEREBY, SAID SWITCH MEANS INCLUDING A PLURALITY OF TERMINAL POSTS FOR SELECTIVE CONNECTION TO ONE OF A PLURALITY OF ELECTRICAL CIRCUITS, BRACKET MEANS MOUNTED ON SAID FRAME, SCREW MEANS SLIDABLY MOUNTED ON SAID BRACKET MEANS AND ENGAGING SAID LEVER, DIFFERENTIAL SPRING MEANS BIASING SAID SCREW MEANS WHEREBY A DIFFERENTIAL SPRING LOAD IS APPLIED TO SAID LEVER.
Claim 2
Dependent Claim
142 words
A PRESSURE RESPONSIVE CONTROL DEVICE COMPRISING A HOUSING FRAME, AN OPERATING LEVER PIVOTALLY MOUNTED ON SAID FRAME, PRESSURE RESPONSIVE MEANS INCLUDING A POWER ELEMENT MOUNTED ON SAID FRAME ABOVE SAID LEVER FOR ENGAGEMENT THEREWITH, A RANGE SPRING HAVING ONE END CONNECTED TO SAID LEVER, A SPRING NUT CONNECTED TO AN OPPOSITE END OF SAID RANGE SPRING, A RANGE ADJUSTMENT SCREW CARRIED BY SAID FRAME AND CONNECTED TO SAID SPRING NUT FOR ADJUSTING SAID RANGE SPRING, SWITCH MEANS CARRIED BY SAID HOUSING BELOW SAID LEVER FOR ACTUATION THEREBY, SAID SWITCH MEANS INCLUDING A PLURALITY OF TERMINAL POSTS FOR SELECTIVE CONNECTION TO ONE OF A PLURALITY OF ELECTRICAL CIRCUITS, BRACKET MEANS MOUNTED ON SAID FRAME, SCREW MEANS SLIDABLY MOUNTED ON SAID BRACKET MEANS AND ENGAGING SAID LEVER, DIFFERENTIAL SPRING MEANS BIASING SAID SCREW MEANS WHEREBY A DIFFERENTIAL SPRING LOAD IS APPLIED TO SAID LEVER.
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |