Patent US2640022A successfully refreshed from Google Patents.
US2640022A
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Composition, bath, and process for chromium plating
Assignee: United Chromium Inc
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Filing: 1950-11-07
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Granted: 1953-05-26
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Expires: 1970-11-07
Abstract
No abstract record available.
Inventors
- 👤 Jesse E Stareck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:33
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A COMPOSITION OF MATTER FOR MAKING UP AN AQUEOUS CHROMIC ACID BATH FOR CHROMIUM PLATING IN THE RANGE OF 100 TO 500 G./1. OF CRO3, COMPRISING ESSENTIALLY ABOUT 72 TO 97 PER CENT BY WEIGHT OF CRO3, AN AMOUNT OF STRONTIUM SULFATE SUFFICIENT TO SATURATE SAID BATH AND TO PROVIDE AN UNDISSOLVED RESIDUE OF STRONTIUM SULFATE IN THE BATH, AN AMOUNT OF POTASSIUM SILICOFLUORIDE SUFFICIENT TO SATURATE SAID BATH AND TO PROVIDE AN UNDISSOLVED RESIDUE OF POTASSIUM SILICOFLUORIDE IN THE BATH, A SOLUBLE NON-CATALYTIC STRONTIUM COMPOUND IN AN AMOUNT CONTAINING 0.21 TO 5.3 PER CENT BY WEIGHT OF STRONTIUM, AND A SOLUBLE NONCATALYTIC POTASSIUM COMPOUND IN AN AMOUNT CONTAINING 0.64 TO 4.7 PER CENT BY WEIGHT POTASSIUM.
Claim 2
Dependent Claim
117 words
A COMPOSITION OF MATTER FOR MAKING UP AN AQUEOUS CHROMIC ACID BATH FOR CHROMIUM PLATING IN THE RANGE OF 100 TO 500 G./1. OF CRO3, COMPRISING ESSENTIALLY ABOUT 72 TO 97 PER CENT BY WEIGHT OF CRO3, AN AMOUNT OF STRONTIUM SULFATE SUFFICIENT TO SATURATE SAID BATH AND TO PROVIDE AN UNDISSOLVED RESIDUE OF STRONTIUM SULFATE IN THE BATH, AN AMOUNT OF POTASSIUM SILICOFLUORIDE SUFFICIENT TO SATURATE SAID BATH AND TO PROVIDE AN UNDISSOLVED RESIDUE OF POTASSIUM SILICOFLUORIDE IN THE BATH, A SOLUBLE NON-CATALYTIC STRONTIUM COMPOUND IN AN AMOUNT CONTAINING 0.21 TO 5.3 PER CENT BY WEIGHT OF STRONTIUM, AND A SOLUBLE NONCATALYTIC POTASSIUM COMPOUND IN AN AMOUNT CONTAINING 0.64 TO 4.7 PER CENT BY WEIGHT POTASSIUM.
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) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |