US2983634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical nickel plating of magnesium and its alloys
Assignee: General American Transportation Corp
•
Filing: 1958-05-13
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Granted: 1961-05-09
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Expires: 1978-05-13
Abstract
No abstract record available.
Inventors
- 👤 Budininkas Pranas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:18
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1803; C23C18/1824; C23C18/1837; C23C18/1844; C23C18/31; C23C18/32; C23C18/34; C23C18/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
THE PROCESS OF PLATING WITH NICKEL THE METAL SURFACE OF A WORK-PIECE, WHEREIN SAID METAL SURFACE IS FORMED ESSENTIALLY OF MAGNESIUM, SAID PROCESS COMPRISING CLEANING SAID METAL SURFACE, THEN TREATING SAID METAL SURFACE WITH A FIRST AQUEOUS SOLUTION OF A PASSIVATING AGENT SELECTED FROM THE CLASS CONSISTING OF CHROMIC ACID AND ORTHOPHOSPHORIC ACID IN ORDER TO FORM A PROTECTIVE FILM THEREUPON TO PREVENT CORROSIVE ATTACK THEREOF BY WATER, THEN TREATING SAID METAL SURFACE WITH A SECOND AQUEOUS SOLUTION OF A FLUORIDE IN ORDER TO FORM A FLUORIDE FILM THEREUPON, THEN TREATING SAID METAL SURFACE WITH A THIRD AQUEOUS SOLUTION OF A PYROPHOSPHATE IN ORDER TO FORM A PHOSPHATE FILM THEREUPON, AND THEN CONTACTING SAID METAL SURFACE WITH AN AQUEOUS CHEMICAL NICKEL PLATING BATH OF THE NICKEL CATION-HYPOPHOSPHITE ANION TYPE ALSO CONTAINING A CITRATE AND A FLUORIDE.
Claim 2
Dependent Claim
136 words
THE PROCESS OF PLATING WITH NICKEL THE METAL SURFACE OF A WORK-PIECE, WHEREIN SAID METAL SURFACE IS FORMED ESSENTIALLY OF MAGNESIUM, SAID PROCESS COMPRISING CLEANING SAID METAL SURFACE, THEN TREATING SAID METAL SURFACE WITH A FIRST AQUEOUS SOLUTION OF A PASSIVATING AGENT SELECTED FROM THE CLASS CONSISTING OF CHROMIC ACID AND ORTHOPHOSPHORIC ACID IN ORDER TO FORM A PROTECTIVE FILM THEREUPON TO PREVENT CORROSIVE ATTACK THEREOF BY WATER, THEN TREATING SAID METAL SURFACE WITH A SECOND AQUEOUS SOLUTION OF A FLUORIDE IN ORDER TO FORM A FLUORIDE FILM THEREUPON, THEN TREATING SAID METAL SURFACE WITH A THIRD AQUEOUS SOLUTION OF A PYROPHOSPHATE IN ORDER TO FORM A PHOSPHATE FILM THEREUPON, AND THEN CONTACTING SAID METAL SURFACE WITH AN AQUEOUS CHEMICAL NICKEL PLATING BATH OF THE NICKEL CATION-HYPOPHOSPHITE ANION TYPE ALSO CONTAINING A CITRATE AND A FLUORIDE.
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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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |