US2829059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroless chromium plating
Assignee: GTE Sylvania Inc
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Filing: 1956-01-26
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Granted: 1958-04-01
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Philip H Eisenberg
- 👤 Douglas O Raleigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:23
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
AN ELECTROLESS CHROMIUM PLATING SOLUTION COMPOSED OF THE FOLLOWING IN AQUEOUS SOLUTION: A HYPOPHOSPHITE SALT HAVING A CONCENTRATION OF ABOUT 10 GRAMS PER LITER; A BUFFERING AGENT; AT LEAST ONE CHROMIC SALT HAVING A CONCENTRATION OF ABOUT 17 GRAMS PER LITER; AND A CHROMIUM DEPOSITION RATE CONTROLLING AGENT SOLUBLE IN THE SOLUTION AND CHARACTERIZED BY THE ABILITY TO REDUCE CHROMIC IONS TO CHROMOUS IONS AND TO FORM A READILY REDUCIBLE COMPLEX WITH SAID CHROMOUS IONS, SAID AGENT BEING SELECTED FROM THE GROUP CONSISTING OF OXALIC ACID AND ITS ALKALI SALTS, SAID AGENT HAVING A CONCENTRATION FALLING WITHIN THE APPROXIMATE RANGE 4.5-9.0 GRAMS PER LITER.
Claim 2
Dependent Claim
104 words
AN ELECTROLESS CHROMIUM PLATING SOLUTION COMPOSED OF THE FOLLOWING IN AQUEOUS SOLUTION: A HYPOPHOSPHITE SALT HAVING A CONCENTRATION OF ABOUT 10 GRAMS PER LITER; A BUFFERING AGENT; AT LEAST ONE CHROMIC SALT HAVING A CONCENTRATION OF ABOUT 17 GRAMS PER LITER; AND A CHROMIUM DEPOSITION RATE CONTROLLING AGENT SOLUBLE IN THE SOLUTION AND CHARACTERIZED BY THE ABILITY TO REDUCE CHROMIC IONS TO CHROMOUS IONS AND TO FORM A READILY REDUCIBLE COMPLEX WITH SAID CHROMOUS IONS, SAID AGENT BEING SELECTED FROM THE GROUP CONSISTING OF OXALIC ACID AND ITS ALKALI SALTS, SAID AGENT HAVING A CONCENTRATION FALLING WITHIN THE APPROXIMATE RANGE 4.5-9.0 GRAMS PER LITER.
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) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |