Patent US3020175A successfully refreshed from Google Patents.
US3020175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical cleaning of printed circuits
Assignee: General Dynamics Corp
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Filing: 1958-06-12
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Granted: 1962-02-06
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Expires: 1978-06-12
Abstract
No abstract record available.
Inventors
- 👤 Edward S Penczek
- 👤 Rollin W Furguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:53
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; C; C23; C23G; C23G1/00; C23G1/02; C23G1/10; C23G1/103; H05K2203/00; H05K2203/03; H05K2203/0392; H05K2203/07; H05K2203/0779; H05K2203/0786; H05K2203/0789; H05K2203/0796; H05K3/30; H05K3/32; H05K3/34; H05K3/3489
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A CHEMICAL CLEANING PROCESS FOR PREPARING FOR DIP SOLDERING THE SURFACES OF COPPER CONDUCTORS THAT ARE DISPOSED ON THE SURFACE OF AN INSULATING BASE OF A PRINTED WRING BOARD, COMPRISING SUBJECTING SAID BOARD TO THE ACTION OF AN ACIDIC OXIDIZING BATH FOR A SUFFICENT PERIOD OF TIME TO REMOVE TARNISH AND SURFACE FILMS FROM THE COPPER CONDUCTORS, THEN SPRAY RISING SAID BOARD WITH A CLEAN AQUEOUS RINSE, THEN SUBJSCTING SAID BOARD TO AN AQUEROUS MINERAL ACID BATH TO REMOVE ANY SALT FORMED ON SAID CONDUCTOR SURFACES IN SAID ACIDIC OXIDIZING BATH,
Claim 2
Dependent Claim
91 words
A CHEMICAL CLEANING PROCESS FOR PREPARING FOR DIP SOLDERING THE SURFACES OF COPPER CONDUCTORS THAT ARE DISPOSED ON THE SURFACE OF AN INSULATING BASE OF A PRINTED WRING BOARD, COMPRISING SUBJECTING SAID BOARD TO THE ACTION OF AN ACIDIC OXIDIZING BATH FOR A SUFFICENT PERIOD OF TIME TO REMOVE TARNISH AND SURFACE FILMS FROM THE COPPER CONDUCTORS, THEN SPRAY RISING SAID BOARD WITH A CLEAN AQUEOUS RINSE, THEN SUBJSCTING SAID BOARD TO AN AQUEROUS MINERAL ACID BATH TO REMOVE ANY SALT FORMED ON SAID CONDUCTOR SURFACES IN SAID ACIDIC OXIDIZING BATH,
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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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |