Patent US4222025A successfully refreshed from Google Patents.
US4222025A
Expired / Lapsed
US
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Resistance thermometers
Assignee: Johnson Matthey PLC
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Filing: 1978-10-05
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Granted: 1980-09-09
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Expires: 1998-10-05
Abstract
Abstract A temperature sensitive element of a resistance thermometer comprising an electrically conductive path formed upon a surface of a cylindrical substrate made from an electrically non-conducting material, said electrically conducting path comprising a layer of fused vitreous material containing an electrically conducting metal selected from the group consisting of gold, silver, platinum, palladium, rhodium, iridium, ruthenium, iron, cobalt, nickel and copper, said element having an outer protective coating made from a glaze.
Inventors
- 👤 Gerald S. Iles
- 👤 Gordon L. Selman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:32
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/183; H; H01; H01C; H01C1/00; H01C1/14; H01C1/142; H01C7/00; H01C7/003; H01C7/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A temperature sensitive element of a resistance thermometer comprising an electrically conductive path formed upon a surface of a cylindrical substrate made from an electrically non-conducting material, said electrically conducting path comprising a layer of fused vitreous material containing an electrically conducting metal selected from the group consisting of gold, silver, platinum, palladium, rhodium, iridium, ruthenium, iron, cobalt, nickel and copper, said element having an outer protective coating made from a glaze.
Claim 2
Dependent Claim
72 words
A temperature sensitive element of a resistance thermometer comprising an electrically conductive path formed upon a surface of a cylindrical substrate made from an electrically non-conducting material, said electrically conducting path comprising a layer of fused vitreous material containing an electrically conducting metal selected from the group consisting of gold, silver, platinum, palladium, rhodium, iridium, ruthenium, iron, cobalt, nickel and copper, said element having an outer protective coating made from a glaze.
Claim 3
Dependent Claim
13 words
An element as in claim 1 wherein said metal is in particulate form.
Claim 4
Dependent Claim
73 words
A temperature sensitive element of a resistance thermometer comprising an electrically conductive path formed upon a surface of a tubular substrate made from an electrically non-conducting material, said electrically conducting path comprising a layer of fused vitreous material containing an electrically conducting metal element selected from the group consisting of gold, silver, platinum, palladium, rhodium, iridium, ruthenium, iron, cobalt, nickel and copper, said element having an outer protective coating made from a glaze.
Claim 5
Dependent Claim
73 words
A temperature sensitive element of a resistance thermometer comprising an electrically conductive path formed upon a surface of a tubular substrate made from an electrically non-conducting material, said electrically conducting path comprising a layer of fused vitreous material containing an electrically conducting metal element selected from the group consisting of gold, silver, platinum, palladium, rhodium, iridium, ruthenium, iron, cobalt, nickel and copper, said element having an outer protective coating made from a glaze.
Claim 6
Dependent Claim
13 words
An element as in claim 3 wherein said metal is in particulate form.
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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |