US3798056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroless plating process
Assignee: AT&T Inc
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Filing: 1972-04-05
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Granted: 1974-03-19
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Expires: 1992-04-05
Abstract
Abstract Improved deposition rates from electroless plating baths are described. The increase in deposition rate, which may be as great as seven-fold, arises from the use of a rotating substrate holder. Where uniformity of thickness is critical, periodic reversal of rotation may be used.
Inventors
- 👤 Y Okinaka
- 👤 R Sard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:28
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C23C18/1601; C23C18/1619; C23C18/1628; C23C18/163; C23C18/1633; C23C18/1655; C23C18/1664; C23C18/1669
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
The method of claim 1 in which the metal to be deposited consists essentially of gold.
Claim 2
Dependent Claim
55 words
The method of claim 2 in which gold is electrolessly deposited from an aqueous solution consisting essentially of KAu(CN)2 in the concentration range of 0.001M to 0.05M, KCN in the concentration range of 0.005M to 0.5M, KOH in the concentration range of 0.05M to 1M, and KBH4 in the concentration range of 0.05M to 1M.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |