Patent US3148100A successfully refreshed from Google Patents.
US3148100A
Expired / Lapsed
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Composition and process for powderless etching
Assignee: Photo-Engravers Res Inc
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Filing: 1961-06-08
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Granted: 1964-09-08
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Expires: 1981-06-08
Abstract
No abstract record available.
Inventors
- 👤 Lewis W Elston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:52
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A PROCESS OF ETCHING PHOTOENGRAVING COPPER TO MAKE THEREIN AN IMAGE IN RELIEF AND INCLUDING CONTACTING THE COPPER IN THE IMAGE AREA WITH ANQUEOUS FERRIC CHLORIDE ETCHING SOLUTION TO MAKE THE IMAGE IN RELIEF THEREIN, AND FORMING A PROTECTIVE FILM ABOUT THE PERIPHERY OF THE IMAGE AREA TO PROVIDE A SUITABLE ETCH FACTOR AND CONTROL UNDERCUTTING, THE STEP WHICH COMPRISES INCLUDING IN THE ETCHING SOLUTION A MEMBER OF THE GROUP CONSISTING OF AS A SOLUTE THEREIN ETHYLENE THIOUREA AND SUBSTITUTED ETHYLENE THIOUREA HAVING A SOLUBILITY OF AT LEAST 0.5 GRAM PER LITER IN WATER, IN AMOUNTS EFFECTIVE TO AID THE FORMING OF THE PROTECTIVE FILM, AND THUS IMPROVE ETCHING BY SAID SOLUTION.
Claim 2
Dependent Claim
113 words
IN A PROCESS OF ETCHING PHOTOENGRAVING COPPER TO MAKE THEREIN AN IMAGE IN RELIEF AND INCLUDING CONTACTING THE COPPER IN THE IMAGE AREA WITH ANQUEOUS FERRIC CHLORIDE ETCHING SOLUTION TO MAKE THE IMAGE IN RELIEF THEREIN, AND FORMING A PROTECTIVE FILM ABOUT THE PERIPHERY OF THE IMAGE AREA TO PROVIDE A SUITABLE ETCH FACTOR AND CONTROL UNDERCUTTING, THE STEP WHICH COMPRISES INCLUDING IN THE ETCHING SOLUTION A MEMBER OF THE GROUP CONSISTING OF AS A SOLUTE THEREIN ETHYLENE THIOUREA AND SUBSTITUTED ETHYLENE THIOUREA HAVING A SOLUBILITY OF AT LEAST 0.5 GRAM PER LITER IN WATER, IN AMOUNTS EFFECTIVE TO AID THE FORMING OF THE PROTECTIVE FILM, AND THUS IMPROVE ETCHING BY SAID SOLUTION.
References Cited (Backward Citations)
US3033725A
Cited
US3033793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |