US2813808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving homogeneity of silver or copper refractory contact materials
Assignee: Gibson Electric Co
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Filing: 1955-04-04
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Granted: 1957-11-19
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Norman S Hoyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:20
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE METHOD OF INFILTRATING A PRESSED AND SINTERED POWDER REFRACTORY COMPACT HAVING A THICKNESS GREATER THAN 1/16 INCH, WITH SILVER WHICH COMPRISES PLACING A SLUGG OF SILVER ON THE SAID REFRACTORY IN A REDUCING ATMOSPHERE, THOROUGHLY MELTING THE SILVER BY HEATING THE COMPOSITE BETWEEN 2000*F. AND 2500*F., AND COOLING THE ENTIRE MASS AT A RATE BELOW 10*F. PER MINUTE TO A TEMPERATURE BELOW 1,760*F.
Claim 2
Independent Claim
64 words
THE METHOD OF INFILTRATING A PRESSED AND SINTERED POWDER REFRACTORY COMPACT HAVING A THICKNESS GREATER THAN 1/16 INCH, WITH SILVER WHICH COMPRISES PLACING A SLUGG OF SILVER ON THE SAID REFRACTORY IN A REDUCING ATMOSPHERE, THOROUGHLY MELTING THE SILVER BY HEATING THE COMPOSITE BETWEEN 2000*F. AND 2500*F., AND COOLING THE ENTIRE MASS AT A RATE BELOW 10*F. PER MINUTE TO A TEMPERATURE BELOW 1,760*F.
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |