US3681257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for electroless plating
Assignee: BAE Systems PLC
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Filing: 1970-06-19
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Granted: 1972-08-01
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Expires: 1990-06-19
Abstract
Abstract A LYOPHILIC MATERIAL IS PREPARED BY HYDROLYSING EGG ALBUMEN WITH A SOLUTION OF LITHIUM HYDROXIDE, PRECIPITATING OUT LITHIUM BY TREATMENT WITH CARBON DIOXIDE AND FILTERING, PRECIPITATING OUT THE REMAINDER OF THE LITHIUM BY TREATMENT WITH PHOSPHORIC ACID AND FILTERING; ADDING ACETIC ACID TO THE RESULTING LIQUOR AND FILTERING OFF THE PRECIPITATE WHICH IS THE LYOPHILIC MATERIAL. FOR USE AS A COLLOID THE LYOPHILIC MATERIAL IS DISSOLVED IN LITHIUM HYDROXIDE TO FORM AN UNUSUALLY ROBUST COLLOID. A PREFERRED USE FOR THE COLLOID IS A PROTECTIVE COLLOID TO PROTECT COLLOIDAL METAL PARTICLES (E.G. PALLADIUM) IN A CATALYST FOR USE IN ELECTROLESS PLATING.
Inventors
- 👤 Joseph Peppo Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:28
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; C23C18/30; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 0
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |