US3554876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for etching and electro plating a printed circuit
Assignee: Raytheon Co
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Filing: 1968-01-29
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Granted: 1971-01-12
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Expires: 1988-01-29
Abstract
Abstract AN INSULATIVE SUBSTRATE HAS AT LEAST ONE CONTINUOUS METAL LAYER SECURED THEREON, WHICH METAL LAYER IS TO BE ETCHED AWAY TO FORM SEPARATE CIRCUIT ELEMENTS. ELECTROPLATING OF ADDITIONAL METAL IS ACCOMPLISHED BEFORE SUCH ETCHING SO THAT THE CONTINUOUS METAL LAYER CAN ACT AS A CATHODE DURING THE ELECTROPLATING PROCESS. THEREAFTER, PORTIONS OF THE METAL LAYER ARE ETCHED AWAY TO DEFINE SEPARATE CIRCUIT ELEMENTS.
Inventors
- 👤 Carl E Keene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:17
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/16; H05K1/167; H05K3/00; H05K3/22; H05K3/24; H05K3/243; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/03; H05K2201/0302; H05K2201/0317; H05K2201/0332; H05K2201/0335; H05K2201/0338; H05K2201/0364; H05K2201/0367; H05K2203/00; H05K2203/03; H05K2203/0361; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K3/02; H05K3/06; H05K3/061; H05K3/062; H05K3/10; H05K3/108; H05K3/38; H05K3/388
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |