US2801935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The use of hydrazine tartrate salts in the chemical deposition of metals
Assignee: Merck and Co Inc
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Filing: 1953-09-30
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Granted: 1957-08-06
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Expires: 1973-09-30
Abstract
No abstract record available.
Inventors
- 👤 John T Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/06; C03C17/10; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; C23C18/40; C23C18/42; C23C18/44; Y; Y10; Y10T; Y10T82/00; Y10T82/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
IN THE ART OF MAKING MIRRORS AND THE LIKE WHEREIN SILVER IS CHEMICALLY DEPOSITED ON A NON-CONDUCTIVE SURFACE, THE IMPROVEMENT WHICH COMPRISES TREATING THE SILVERED SURFACE SIMULTANEOUSLY WITH A SOLUTION OF A COPPER SALT, SODIUM-POTASSIUM TARTRATE AND ALKALI AND A SOLUTION TO FORM COPPER BACKING OVER THE SILVERED SURFACE WHICH TO FORM A COPPER BACKING OVER THE SILVERED SURFACE WHICH COVERS PIN-HOLES IN THE SILVERED SURFACE AND PROVIDES A DURABLE BACKING THEREFOR WITHOUT INJURING TO THE SILVERED SURFACE.
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |