Patent US3287191A successfully refreshed from Google Patents.
US3287191A
Expired / Lapsed
US
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Etching of printed circuit components
Assignee: Photo-Engravers Res Inc
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Filing: 1963-07-23
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Granted: 1966-11-22
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Expires: 1983-07-23
Abstract
No abstract record available.
Inventors
- 👤 Paul F Borth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:23
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/067; C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18; H05K3/061; H05K3/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN THE ETCHING OF A PRINTED CIRCUIT COMPONENT CHARACTERIZED BY THE USE OF A METAL MORE NOBLE THAN COPPER DEPOSITED ON COPPER, WHEREIN IT IS DESIRED TO ETCH AWAY UNDESIRED COPPER, THE IMPROVEMENT WHICH COMPRISES ETCHING SAID COMPONENT WITH AN AQUEOUS FERRIC CHLORIDE ETCHING SOLUTION ADDITIONALLY CONTAINING A MIXTURE OF AGENTS CONSISTING ESSENTIALLY OF (1) A MEMBER OF THE GROUP CONSISTING OF ETHYLENE THIOUREA AND SUBSTITUTED ETHYLENE THIOUREA, AND (2) A FILM MODIFIER WHICH FORMS IN SAID FERRIC CHLORIDE SOLUTION A COMPOUND OF THE FORMULA: 1-W,2-X,3-Y,5-Z-BENZENE WHEREIN, W, X, Y AND Z ARE EACH SELECTED FROM THE GROUP CONSISTING OF NITROSO, AMINO, LOWER ALKYL SUBSTITUTED AMINO, ACID RADICAL OF A LOWER FATTY ACID, HYDROXY, AND HYDROGEN WITH THE PROVISO THAT AT LEAST TWO OF W, X, Y AND Z ARE OTHER THAN HYDROGEN AND ARE IN ORTHO OR PARA RELATION.
Claim 2
Dependent Claim
140 words
IN THE ETCHING OF A PRINTED CIRCUIT COMPONENT CHARACTERIZED BY THE USE OF A METAL MORE NOBLE THAN COPPER DEPOSITED ON COPPER, WHEREIN IT IS DESIRED TO ETCH AWAY UNDESIRED COPPER, THE IMPROVEMENT WHICH COMPRISES ETCHING SAID COMPONENT WITH AN AQUEOUS FERRIC CHLORIDE ETCHING SOLUTION ADDITIONALLY CONTAINING A MIXTURE OF AGENTS CONSISTING ESSENTIALLY OF (1) A MEMBER OF THE GROUP CONSISTING OF ETHYLENE THIOUREA AND SUBSTITUTED ETHYLENE THIOUREA, AND (2) A FILM MODIFIER WHICH FORMS IN SAID FERRIC CHLORIDE SOLUTION A COMPOUND OF THE FORMULA: 1-W,2-X,3-Y,5-Z-BENZENE WHEREIN, W, X, Y AND Z ARE EACH SELECTED FROM THE GROUP CONSISTING OF NITROSO, AMINO, LOWER ALKYL SUBSTITUTED AMINO, ACID RADICAL OF A LOWER FATTY ACID, HYDROXY, AND HYDROGEN WITH THE PROVISO THAT AT LEAST TWO OF W, X, Y AND Z ARE OTHER THAN HYDROGEN AND ARE IN ORTHO OR PARA RELATION.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |