US3845443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film resistance thermometer
Assignee: Elsag International BV
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Filing: 1973-11-12
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Granted: 1974-10-29
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Expires: 1993-11-12
Abstract
Abstract A resistance thermometer comprising a rigid support substrate coated with glass in which is bonded and hermetically sealed a narrow thin-film of metal in meandering or serpentine configuration.
Inventors
- 👤 E Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:56
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/02; H01C1/034; G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/183; H01C17/00; H01C17/06; H01C17/075; H01C17/12; H01C7/00; H01C7/02; H01C7/021; H01C7/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A resistance thermometer comprising a ceramic member having a smooth surface forming a rigid support substrate, an alumina glass precoat welded to and completely covering said smooth surface, a narrow thin-film of metal arranged in serpantine configuration welded to said alumina glass precoat and an alumina glass topcoat completely covering and welded to said glass precoat and said metal film whereby said metal film is hermatically sealed within said glass precoat and topcoat.
Claim 2
Dependent Claim
73 words
A resistance thermometer comprising a ceramic member having a smooth surface forming a rigid support substrate, an alumina glass precoat welded to and completely covering said smooth surface, a narrow thin-film of metal arranged in serpantine configuration welded to said alumina glass precoat and an alumina glass topcoat completely covering and welded to said glass precoat and said metal film whereby said metal film is hermatically sealed within said glass precoat and topcoat.
Claim 3
Dependent Claim
18 words
A resistance thermometer as set forth in claim 1 wherein said rigid support substrate is an aluminum oxide.
Claim 4
Dependent Claim
17 words
A resistance thermometer as set forth in claim 1 wherein said rigid support substrate is a sapphire.
Claim 5
Dependent Claim
23 words
A resistance thermometer as set forth in claim 1 wherein said thin-film of metal is a noble metal having a predetermined temperature coefficient.
Claim 6
Dependent Claim
15 words
A resistance thermometer as set forth in claim 4 wherein said noble material is platinum.
Claim 7
Dependent Claim
16 words
A resistance thermometer as set forth in claim 1 wherein said substrate is rectangular in shape.
Claim 8
Dependent Claim
29 words
A resistance thermometer as set forth in claim 1 wherein said substrate is circular in shape and said thin-film of metal is in the form of a flat helix.
Claim 9
Dependent Claim
27 words
A resistance thermometer as set forth in claim 1 wherein said substrate is a cylinder and said thin-film of metal is a cylindrical helix around said cylinder.
Claim 10
Dependent Claim
19 words
A resistance thermometer as set forth in claim 1 wherein said thin-film of metal is a thin-film of nickel.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |