Patent US2827399A successfully refreshed from Google Patents.
US2827399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroless deposition of iron alloys
Assignee: GTE Sylvania Inc
•
Filing: 1956-03-28
•
Granted: 1958-03-18
•
Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 Philip H Eisenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:02
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/48; C23C18/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
THE METHOD FOR ELECTROLESSLY DEPOSITING AN IRON ALLOY ON THE SURFACE OF A METALLIC SUBSTRATE, WHICH COMPRISES THE STEPS OF INSERTING SAID SUBSTRATE INTO AN ELECTROLESS PLATING BATH CONSISTING OF AN AQUEOUS SOLUTION CONTAINING A FERROUS SALT TOGETHER WITH A SALT OF AT LEAST ONE METAL FROM THE GROUP COMPOSED OF COBALT, NICKEL AND CHROMIUM, THE POSITIVE METAL IONS BEING PRESENT IN THEIR LOWEST IONIC VALENCE STATE, SAID FERROUS ALT AND SAID ONE METAL SALT HAVING A COMBINED CONCENTRATION FALLING WITHIN THE APPROXIMATE RANGE 40-60 GRAMS PER LITER, THE FERROUS SALT CONCENTRATION BEING AT LEAST 50% BY WEIGHT OF SAID COMBINED CONCENTRATION; A HYPOPHOSPHITE SALT HAVING AN APPROXIMATE CONCENTRATION OF ABOUT 1/ GRAMS PER LITER; AND AT LEAST ONE BUFFERING, SEQUESTERING AND REDUCING AGENT SOLUBLE IN THE BATH, SAID AGENT BEING SELECTED FROM AT LEAST ONE ELEMENT OF THE GROUP CONSISTING OF OXALIC ACID AND ITS SALTS, CITRIC ACID AND ITS SALTS, AND ROCHELLE SALTS, THE CONCENTRATION OF SAID AGENT FALLING WITHIN THE APPROXIMATE RANGE 50-160 GRAMS PER LITER; AND MAINTAINING THE PH OF SAID BATH IN THE BASIC REGION UNTIL THE ELECTROLESS DEPOSITION IS CARRIED TO COMPLETION.
Claim 2
Independent Claim
188 words
THE METHOD FOR ELECTROLESSLY DEPOSITING AN IRON ALLOY ON THE SURFACE OF A METALLIC SUBSTRATE, WHICH COMPRISES THE STEPS OF INSERTING SAID SUBSTRATE INTO AN ELECTROLESS PLATING BATH CONSISTING OF AN AQUEOUS SOLUTION CONTAINING A FERROUS SALT TOGETHER WITH A SALT OF AT LEAST ONE METAL FROM THE GROUP COMPOSED OF COBALT, NICKEL AND CHROMIUM, THE POSITIVE METAL IONS BEING PRESENT IN THEIR LOWEST IONIC VALENCE STATE, SAID FERROUS ALT AND SAID ONE METAL SALT HAVING A COMBINED CONCENTRATION FALLING WITHIN THE APPROXIMATE RANGE 40-60 GRAMS PER LITER, THE FERROUS SALT CONCENTRATION BEING AT LEAST 50% BY WEIGHT OF SAID COMBINED CONCENTRATION; A HYPOPHOSPHITE SALT HAVING AN APPROXIMATE CONCENTRATION OF ABOUT 1/ GRAMS PER LITER; AND AT LEAST ONE BUFFERING, SEQUESTERING AND REDUCING AGENT SOLUBLE IN THE BATH, SAID AGENT BEING SELECTED FROM AT LEAST ONE ELEMENT OF THE GROUP CONSISTING OF OXALIC ACID AND ITS SALTS, CITRIC ACID AND ITS SALTS, AND ROCHELLE SALTS, THE CONCENTRATION OF SAID AGENT FALLING WITHIN THE APPROXIMATE RANGE 50-160 GRAMS PER LITER; AND MAINTAINING THE PH OF SAID BATH IN THE BASIC REGION UNTIL THE ELECTROLESS DEPOSITION IS CARRIED TO COMPLETION.
References Cited (Backward Citations)
US2532283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |