US3147148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing a silver and phenolformaldehyde resin paint from an article
Assignee: AT&T Inc
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Filing: 1962-08-28
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Granted: 1964-09-01
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Expires: 1982-08-28
Abstract
No abstract record available.
Inventors
- 👤 Jim R Goodin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C09; C09D; C09D9/00; H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06573; H01C17/06586
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF REMOVING A DRIED PAINT CONSISTING OF ABOUT 80 TO 92% BY WEIGHT METALLIC SILVER AND ABOUT 20 TO 8% BY WEIGHT OF A PHENOL-FORMALDEYDE RESIN FROM DEPOSITED CARBON RESISTORS, WHICH COMPRISES: IMMERSING THE RESISTORS IN AN UNHEATED SOLUTION OF CONCENTRATED NITRIC ACID FOR A PERIOD OF AT LEAST 2 HOURS BUT NOT IN EXCESS OF 16 HOURS TO REMOVE THE SILVER FROM THE RESIN SUCH THAT THE RESIN IS A CELLULAR MASS; WASHING THE RESISTORS TO REMOVE THE NITRIC ACID, AND THE RESULTING SILVER NITRATE AND LOOSENED RESIN; AND IMMERSING THE RESISTORS IN AN UNHEATED AQUEOUS SOLUTION OF 5 TO 10% BY WEIGHT SODIUM HYPOCHLORITE FOR AT LEAST 4 HOURS BUT NOT IN EXCESS OF 16 HOURS TO REMOVE THE CELLULATED RESIN FROM THE RESISTOR.
Claim 2
Independent Claim
128 words
THE METHOD OF REMOVING A DRIED PAINT CONSISTING OF ABOUT 80 TO 92% BY WEIGHT METALLIC SILVER AND ABOUT 20 TO 8% BY WEIGHT OF A PHENOL-FORMALDEYDE RESIN FROM DEPOSITED CARBON RESISTORS, WHICH COMPRISES: IMMERSING THE RESISTORS IN AN UNHEATED SOLUTION OF CONCENTRATED NITRIC ACID FOR A PERIOD OF AT LEAST 2 HOURS BUT NOT IN EXCESS OF 16 HOURS TO REMOVE THE SILVER FROM THE RESIN SUCH THAT THE RESIN IS A CELLULAR MASS; WASHING THE RESISTORS TO REMOVE THE NITRIC ACID, AND THE RESULTING SILVER NITRATE AND LOOSENED RESIN; AND IMMERSING THE RESISTORS IN AN UNHEATED AQUEOUS SOLUTION OF 5 TO 10% BY WEIGHT SODIUM HYPOCHLORITE FOR AT LEAST 4 HOURS BUT NOT IN EXCESS OF 16 HOURS TO REMOVE THE CELLULATED RESIN FROM THE RESISTOR.
References Cited (Backward Citations)
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Cited
US2208294A
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US2637670A
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Cited
US3047508A
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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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |