US5163327A
Expired / Lapsed
US
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Pressure sensing elements
Assignee: Johnson Service Co
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Filing: 1991-01-10
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Granted: 1992-11-17
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Expires: 2011-01-10
Abstract
Abstract Pressure vessel components of a sensing element are formed from liquid crystal polymers. Individual LCP components may be ultrasonically adhered to one another to form a hermetic seal. In the preferred embodiment, a metal tube is hermetically sealed to a pressure vessel cup by molding an LCP resin around a cleaned and heated tube to form a hermetic seal. Also in the preferred embodiment, the sensing element includes a single convolution diaphragm formed under heat and pressure using a polyimide film.
Inventors
- 👤 Richard A. Papai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:32
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/14; G01L19/0007; G01L19/0046; G01L19/08; G01L19/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
A pressure sensing element comprising a pressure vessel, conduit means for coupling said sensing element to an environment, a diaphragm contained within said pressure vessel and wherein said pressure vessel includes at least one structural component comprising a liquid crystal polymer, and wherein said conduit means is hermetically joined to said sensing element by molding a liquid crystal polymer component about said conduit means.
Claim 2
Dependent Claim
64 words
A pressure sensing element comprising a pressure vessel, conduit means for coupling said sensing element to an environment, a diaphragm contained within said pressure vessel and wherein said pressure vessel includes at least one structural component comprising a liquid crystal polymer, and wherein said conduit means is hermetically joined to said sensing element by molding a liquid crystal polymer component about said conduit means.
Claim 3
Dependent Claim
28 words
The sensing element of claim 1 wherein said sensing element includes a cup as part of said vessel and said cup is formed of a liquid crystal polymer.
Claim 4
Dependent Claim
13 words
The sensing element of claim 2 wherein said liquid crystal polymer is filled.
Claim 5
Dependent Claim
31 words
The sensing element of claim 1 wherein said sensing element comprises a plurality of structural components forming said pressure vessel, at least two of said elements comprising a liquid crystal polymer.
Claim 6
Dependent Claim
17 words
The sensing element of claim 4 wherein said liquid crystal polymer components are joined to one another.
Claim 7
Dependent Claim
18 words
The sensing element of claim 5 wherein said liquid crystal polymer components are ultrasonically welded to one another.
Claim 8
Dependent Claim
14 words
The sensing element of claim 1 wherein said conduit means is a copper tube.
Claim 9
Dependent Claim
19 words
The sensing element of claim 1 wherein said liquid crystal polymer component comprises a cap for said pressure vessel.
Claim 10
Dependent Claim
17 words
The sensing element of claim 8 wherein said cap is joined to a liquid crystal polymer cup.
Claim 11
Dependent Claim
15 words
The sensing element of claim 9 wherein said cap is ultrasonically welded to said cup.
Claim 12
Dependent Claim
13 words
The sensing element of claim 1 wherein said liquid crystal polymer is filled.
Claim 13
Dependent Claim
49 words
A pressure sensing element comprising a pressure vessel, conduit means for coupling said sensing element to an environment, a diaphragm contained within said pressure vessel and wherein said pressure vessel includes at least one structural component comprising a liquid crystal polymer and wherein said diaphragm comprises a polyimide film.
Claim 14
Dependent Claim
49 words
A pressure sensing element comprising a pressure vessel, conduit means for coupling said sensing element to an environment, a diaphragm contained within said pressure vessel and wherein said pressure vessel includes at least one structural component comprising a liquid crystal polymer and wherein said diaphragm comprises a polyimide film.
Claim 15
Dependent Claim
20 words
The sensing element of claim 12 wherein said polyimide film is a single convolution diaphragm, formed under heat and pressure.
Claim 16
Dependent Claim
22 words
The sensing element of claim 13 wherein a lubricant was applied to said film during its formation into a single convolution diaphragm.
Claim 17
Dependent Claim
75 words
A pressure sensing element comprising a pressure vessel, conduit means for coupling said sensing element to an environment, a diaphragm contained within said pressure vessel and a cup forming part of the pressure vessel, said cup being formed of a liquid crystal polymer, and wherein at least one additional structural component of said sensing element is also formed from a liquid crystal polymer, said additional component and said cup being ultrasonically welded to one another.
Claim 18
Dependent Claim
75 words
A pressure sensing element comprising a pressure vessel, conduit means for coupling said sensing element to an environment, a diaphragm contained within said pressure vessel and a cup forming part of the pressure vessel, said cup being formed of a liquid crystal polymer, and wherein at least one additional structural component of said sensing element is also formed from a liquid crystal polymer, said additional component and said cup being ultrasonically welded to one another.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |