Patent US3856048A successfully refreshed from Google Patents.
US3856048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydropneumatic accumulator
Assignee: Individual
•
Filing: 1973-06-18
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Granted: 1974-12-24
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Expires: 1993-06-18
Abstract
Abstract This invention relates to a hydropneumatic accumulator comprising a piston and cylinder arrangement defining in the cylinder a first compartment in which is provided a gas which is under pressure and which has a density less than that of nitrogen and a second compartment in which liquid is provided. Helium is the gas preferably used, such that, on the one hand, a much larger volume of the liquid can be stored in the accumulator at a predetermined pressure than is possible using nitrogen, and, on the other hand, the variations in pressure due to variations in temperature is much less than with nitrogen. The invention is particularly applicable to hydraulic controls for electric circuit breakers.
Inventors
- 👤 J Gratzmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:19
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/06; F15B1/00; F15B1/02; F15B1/04; F15B1/08; F15B1/24; H; H01; H01H; H01H33/00; H01H33/02; H01H33/53; F15B2201/00; F15B2201/20; F15B2201/205; F15B2201/30; F15B2201/31; F15B2201/312; F15B2201/40; F15B2201/41; F15B2201/415; F15B2201/4155; Y; Y02; Y02E; Y02E70/00; Y02E70/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A hydropneumatic accumulator comprising a sealed cylinder having a piston slidably located therein and defining with the cylinder a first compartment and a second compartment, the second compartment enclosing a liquid and the first compartment enclosing a body of gas compressed to a maximum operating pressure of at least 200 kg/cm2, said gas having a density less than that of nitrogen.
Claim 2
Dependent Claim
61 words
A hydropneumatic accumulator comprising a sealed cylinder having a piston slidably located therein and defining with the cylinder a first compartment and a second compartment, the second compartment enclosing a liquid and the first compartment enclosing a body of gas compressed to a maximum operating pressure of at least 200 kg/cm2, said gas having a density less than that of nitrogen.
Claim 3
Dependent Claim
17 words
An accumulator according to claim 1, in which the gas enclosed in the first compartment is helium.
Claim 4
Dependent Claim
17 words
An accumulator according to claim 1, in which the gas enclosed in the first compartment is hydrogen.
Claim 5
Dependent Claim
17 words
An accumulator according to claim 1, in which the gas enclosed in the first compartment is neon.
Claim 6
Dependent Claim
24 words
An accumulator according to claim 1 in which the gas is compressed to a maximum operating pressure of between 300 and 1, 000 kg/cm2.
Claim 7
Dependent Claim
84 words
In an hydropneumatic accumulator comprising a sealed cylinder having a piston slidably located therein and defining with the cylinder a first compartment enclosing a gas under pressure and a second compartment enclosing a liquid, the improvement that the gas enclosed in the first compartment is a gas of a density less than that of nitrogen, and the liquid enclosed in the second compartment is a liquefiable gas kept in the liquid state by the pressure exerted by the gas contained in the first compartment.
Claim 8
Dependent Claim
84 words
In an hydropneumatic accumulator comprising a sealed cylinder having a piston slidably located therein and defining with the cylinder a first compartment enclosing a gas under pressure and a second compartment enclosing a liquid, the improvement that the gas enclosed in the first compartment is a gas of a density less than that of nitrogen, and the liquid enclosed in the second compartment is a liquefiable gas kept in the liquid state by the pressure exerted by the gas contained in the first compartment.
Claim 9
Dependent Claim
17 words
An accumulator according to claim 6, in which the gas enclosed in the first compartment is helium.
Claim 10
Dependent Claim
25 words
An accumulator according to claim 6, in which the liquid enclosed in the second compartment is a liquefiable dielectric gas kept in the liquid state.
Claim 11
Dependent Claim
20 words
An accumulator according to claim 6, in which the liquid enclosed in the second compartment is liquefied hexafluoride of sulphur.
References Cited (Backward Citations)
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |