US3294934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive devices
Assignee: Individual
•
Filing: 1964-01-21
•
Granted: 1966-12-27
•
Expires: 1984-01-21
Abstract
No abstract record available.
Inventors
- 👤 J T Norris
- 👤 Wilburn O Castleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PRESSURE RESPONSIVE DEVICE COMPRISING A CYLINDER HAVING A SURROUNDING WALL, A PISTON MOVABLY MOUNTED IN THE CYLINDER, A LIQUID LEVEL DEVICE HAVING A COLUMN OF CORROSIVE LIQUID EXPOSED AT ONE SIDE TO A PRESSURE FLUID AND AT THE OPPOSITE SIDE TO THE PISTON, A BODY OF LUBRICANT INTERMEDIATE SAID COLUMN OF LIQUID CORROSIVE FLUID AND THE PISTON FOR TRANSMITTING PRESSURE TO THE PISTON AND MOVING THE LATTER IN RESPONSE TO VARIATIONS IN PRESSURE OF THE FLUID, A PISTON ROD CONNECTED WITH THE PISTON AND EXTENDING OUTWARDLY THEREFROM, MEANS YIELDABLY URGING THE PISTON TOWARD ONE END, A BEARING MEMBER MOUNTED ON THE PISTON ROD FOR MOVEMENT AXIALLY RELATIVE THERETO, MEANS YIELD-
Claim 2
Dependent Claim
111 words
A PRESSURE RESPONSIVE DEVICE COMPRISING A CYLINDER HAVING A SURROUNDING WALL, A PISTON MOVABLY MOUNTED IN THE CYLINDER, A LIQUID LEVEL DEVICE HAVING A COLUMN OF CORROSIVE LIQUID EXPOSED AT ONE SIDE TO A PRESSURE FLUID AND AT THE OPPOSITE SIDE TO THE PISTON, A BODY OF LUBRICANT INTERMEDIATE SAID COLUMN OF LIQUID CORROSIVE FLUID AND THE PISTON FOR TRANSMITTING PRESSURE TO THE PISTON AND MOVING THE LATTER IN RESPONSE TO VARIATIONS IN PRESSURE OF THE FLUID, A PISTON ROD CONNECTED WITH THE PISTON AND EXTENDING OUTWARDLY THEREFROM, MEANS YIELDABLY URGING THE PISTON TOWARD ONE END, A BEARING MEMBER MOUNTED ON THE PISTON ROD FOR MOVEMENT AXIALLY RELATIVE THERETO, MEANS YIELD-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |