US3590641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure gage
Assignee: Microdot Inc
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Filing: 1968-06-06
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Granted: 1971-07-06
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Expires: 1988-06-06
Abstract
Abstract A direct reading pressure gage having a coupler chamber at one end and a Bourdon tube on the other connected by a capillary tube. The coupler chamber, capillary and Bourdon tubes are filled with a liquid having a total volume in the order of 0.004 cubic inch to minimize volumetric displacement.
Inventors
- 👤 Gerard D Eggleston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:27
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A direct measurement pressure gage comprising a frame having a coupler chamber at one end and a capillary tube extending through the frame from the chamber, a sensor assembly connected to the capillary tube, said sensor including a Bourdon Tube in the form of a helix with a plurality of turns and which displaces in response to changes in pressure, said coupler chamber being closed by a thin, flexible diaphragm liquid filling the chamber, capillary and Bourdon tubes, a filler insert in the Bourdon tube to reduce its liquid volume, the volume of liquid in the tubes and chamber being approximately in the order of .004 cubic inch, and a dial indicator including a pointer connected to the Bourdon tube.
Claim 2
Dependent Claim
120 words
A direct measurement pressure gage comprising a frame having a coupler chamber at one end and a capillary tube extending through the frame from the chamber, a sensor assembly connected to the capillary tube, said sensor including a Bourdon Tube in the form of a helix with a plurality of turns and which displaces in response to changes in pressure, said coupler chamber being closed by a thin, flexible diaphragm liquid filling the chamber, capillary and Bourdon tubes, a filler insert in the Bourdon tube to reduce its liquid volume, the volume of liquid in the tubes and chamber being approximately in the order of .004 cubic inch, and a dial indicator including a pointer connected to the Bourdon tube.
Claim 3
Dependent Claim
45 words
A direct measurement pressure gage as defined in claim 1 further characterized by a sleeve rotatable on the frame adjacent the chamber, and a threaded section provided in the sleeve to enable the gage to be secured into a threaded hole without rotating the frame.
Claim 4
Dependent Claim
19 words
A direct measurement pressure gage as defined in claim 1 further characterized by said frame having a flexible section.
Claim 5
Dependent Claim
28 words
A direct measurement pressure gage as defined in claim 1 further characterized by said pointer being connected directly to the end of the tube for indicating tube deflection.
Claim 6
Dependent Claim
29 words
A direct measurement pressure gage as defined in claim 1 further characterized by a post disposed within the helix and frictionally engaging the turns for stabilizing the Bourdon tube.
Claim 7
Dependent Claim
37 words
A direct measurement pressure gage as defined in claim 4 further characterized by said Bourdon tube being flattened in the portion that forms the turns and having portions of circular cross section extending tangentially from each end.
Claim 8
Dependent Claim
38 words
A direct measurement pressure gage as defined in claim 6 further characterized by one circular section of the tube being coupled to the end of the capillary tube and the other circular section being coupled to the pointer.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |