US3594291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright zinc plating from an acid electrolyte
Assignee: Bayer Pharma AG
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Filing: 1969-07-24
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Granted: 1971-07-20
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Expires: 1989-07-24
Abstract
Abstract MIRROR BRIGHT ZINC ELECTRODEPOSITS ARE FORMED FROM ACID ZINC PLATING SOLUTIONS CONTAINING AS BRIGHTENERS N-POLYVINYLPYRROLIDONE-(2) AND A KETONE OF THE FORMULA R1-(CH=CH)N-CO-R2 WHEREIN R1 IS PHENYL, MONO- OR DIHYDROXYPHENYL OR TRIHYDROXYPHENYL METHYLENEDIOXYPHENYL, MONO- DI- OR TRILOWER-ALKYLPHENYL, MONO- OR DI- OR TRI-LOWER-ALKOXYPHENYL, FURYL, THIENYL, COUMARYL, OR PYRIDYL, AND R2 MAY BE LOWER ALKYL, LOWER ALKENYL, LOWER-ALKYL-CARBONYL-LOWERALKYLENE, CYANO-LOWER-ALKYLENE, LOWER-ALKOXY-CARBONYLLOWER-ALKYLENE, OR -(CH=CH)N-C6H5, N BEING 1 OR 0.
Inventors
- 👤 Hans-Gunther Todt
- 👤 Gunter Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:32
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |