US3880008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for occasionally determining the pressure in a hydraulic or pneumatic system
Assignee: Individual
•
Filing: 1973-04-02
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Granted: 1975-04-29
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Expires: 1993-04-02
Abstract
Abstract For the purpose of occasionally determining the pressure in a hydraulic or pneumatic system, an element of the system is replaced by a similar element which has the same function in the normal operation of the system and has a wall which surrounds a cavity to which the hydraulic or pneumatic fluid in the system has access and is again permanently surrounded by a capacitor electrode, said capacitor electrode forming together with said wall a hydraulic or pneumatic pressure sensing capacitor, which may be connected to a calibrated capacity measuring device whenever it is desired to determine the hydraulic or pneumatic pressure within the system.
Inventors
- 👤 Nils Aage Juul Eilersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:41
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0005; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A non-return valve for a fuel injection pump comprising an elongated substantially cylindrical valve housing having a longitudinal flow passage surrounded by a cylindrical wall of a length and wall-thickness suitable for making it operable as a pressure sensitive electrode of a pressure sensing capacitor when subjected to the pressure of fuel flowing through said flow passage, and a tubular element surrounding said wall and insulated therefrom to form a counter electrode of said pressure sensing capacitor.
Claim 2
Dependent Claim
77 words
A non-return valve for a fuel injection pump comprising an elongated substantially cylindrical valve housing having a longitudinal flow passage surrounded by a cylindrical wall of a length and wall-thickness suitable for making it operable as a pressure sensitive electrode of a pressure sensing capacitor when subjected to the pressure of fuel flowing through said flow passage, and a tubular element surrounding said wall and insulated therefrom to form a counter electrode of said pressure sensing capacitor.
Claim 3
Dependent Claim
16 words
A valve as in claim 1, wherein said tubular element is surrounded by a protecting sleeve.
Claim 4
Dependent Claim
22 words
A valve as in claim 2, wherein said protecting sleeve is of metal and is in metallic contact with said valve housing.
Claim 5
Dependent Claim
24 words
A valve as in claim 3, wherein said protecting sleeve is provided at its outer end with a collar firmly engaging said valve housing.
Claim 6
Dependent Claim
39 words
A valve as in claim 2, wherein said sleeve has a hole through which a contact pin may be inserted to engage said tubular element, insulating means being provided for preventing contact between the contact pin and the sleeve.
Claim 7
Dependent Claim
26 words
A valve as in claim 4, wherein said insulating means comprise an O-ring, which is clamped between said tubular element and the edge of said hole.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |