Patent US2757104A successfully refreshed from Google Patents.
US2757104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming precision resistor
Assignee: Metalholm Engineering Corp
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Filing: 1953-04-15
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Granted: 1956-07-31
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Expires: 1973-04-15
Abstract
No abstract record available.
Inventors
- 👤 Howes Ronald Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:25
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/26; H01C17/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE PROCESS OF FORMING A PRECISION FILM OF PREDETERMINED RESISTIVITY UPON A NON-CONDUCTIVE CARRIER WHICH COMPRISES FORMING UPON SAID CARRIER A PRIMARY FILM COMPRISING A FIELD OF SMALL PARTICLES OF SILVER, REMOVING A PORTION OF SAID SILVER FILM AND SIMULTANEOUSLY SUBSTITUTING THEREFOR PARTICLES OF AT LEAST ONE METAL HAVING AN ELECTROMOTIVE POTENTIAL LOWER THAN THAT OF SILVER AND WHOSE OXIDE HAS A RELATIVELY HIGH NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE BY APPLYING TO SAID PRIMARY FILM A SUBSTITUTION BATH CONTAINING A SILUTE CONSTITUENT OF SAID ONE METAL WHEREBY TO CONVERT SAID PRIMARY FILM INTO AN ALLOY FIELD OF PREDETERMINED COMPOSITION, AND THEREAFTER HEATING SAID FILM TO OXIDE SURFACE ELEMENTS OF SAID ALLOY FIELD TO RAISE THE RESISTIVITY OF SAID ALLOY FIELD TO A PREDETERMINED VALUE WHEREAT ITS TEMPERATURE COEFFICIENT OF RESISTANCE IS SUBSTANTIALLY ZERO.
Claim 2
Dependent Claim
133 words
THE PROCESS OF FORMING A PRECISION FILM OF PREDETERMINED RESISTIVITY UPON A NON-CONDUCTIVE CARRIER WHICH COMPRISES FORMING UPON SAID CARRIER A PRIMARY FILM COMPRISING A FIELD OF SMALL PARTICLES OF SILVER, REMOVING A PORTION OF SAID SILVER FILM AND SIMULTANEOUSLY SUBSTITUTING THEREFOR PARTICLES OF AT LEAST ONE METAL HAVING AN ELECTROMOTIVE POTENTIAL LOWER THAN THAT OF SILVER AND WHOSE OXIDE HAS A RELATIVELY HIGH NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE BY APPLYING TO SAID PRIMARY FILM A SUBSTITUTION BATH CONTAINING A SILUTE CONSTITUENT OF SAID ONE METAL WHEREBY TO CONVERT SAID PRIMARY FILM INTO AN ALLOY FIELD OF PREDETERMINED COMPOSITION, AND THEREAFTER HEATING SAID FILM TO OXIDE SURFACE ELEMENTS OF SAID ALLOY FIELD TO RAISE THE RESISTIVITY OF SAID ALLOY FIELD TO A PREDETERMINED VALUE WHEREAT ITS TEMPERATURE COEFFICIENT OF RESISTANCE IS SUBSTANTIALLY ZERO.
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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) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |