Patent US2994121A successfully refreshed from Google Patents.
Patent US2787589A successfully refreshed from Google Patents.
US2787589A
Expired / Lapsed
US
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Chromium plating
Assignee: Primerica Inc
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Filing: 1954-08-12
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Granted: 1957-04-02
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Expires: 1974-08-12
Abstract
No abstract record available.
Inventors
- 👤 Jesse E Stareck
- 👤 Dow Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:44
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD OF ELECTRODEPOSITING CRACK-FREE, CHROMIUM PLATE ON AN ARTICLE OF METAL WHICH COMPRISES ESSENTIALLY PASSING CURRENT IN THE RANGE OF 0.5 TO 8 AMPERES PER SQUARE INCH FROM AN ANODE TO SAID ARTICLE AS A CATHODE IMMERSED IN AN AQUEOUS CHROMIUM PLATING BATH AT A TEMPERATURE OF 140*F. TO THE BOILING POINT OF THE BATH, SAID BATH COMPRISING ESSENTIALLY 200 TO 900 G./. CRO3 AT LEAST ONE SOLUBLE SULFATE-CONTAINING COMPOUND IN AN AMOUNT SUFFICIENT TO PRODUCE A CONCENTRATION OF 0.3 TO 5.5 G./1. OF DISSOLVED SULFATE (SO4=) AND AT LEAST ONE SOLUBLE SILICOFLUORIDE-CONTAINING COMPOUND IN AN AMOUNT SUFFICIENT TO PRODUCE A CONCENTRATION OF 1.0 TO 11.4 G./1. OF DISSOLVED SILICOFLUORIDE (DIF6=), SAID BATH BEING FREE OF COMPOUNDS ACTING TO SUPPRESS THE CONCENTRATIONS OF DISSOLVED SULFATE AND SILICOFLUORIDE, THE SUM OF SAID DISSOLVED SULFATE AND SILICOFLUORIDE BEING IN THE RANGE OF 1.5 TO 11.7 G./1., AND SAID SUM OF DISSOLVED SULFATE AND SILICOFLUORIDE VARYING WITH THE CRO3 CONCENTRATION IN THE MANNER DEFINED BY THE AREA ABCD OF THE GRAPH SHOWN IN THE ACCOMPANYING DRAWING.
Claim 2
Independent Claim
174 words
A METHOD OF ELECTRODEPOSITING CRACK-FREE, CHROMIUM PLATE ON AN ARTICLE OF METAL WHICH COMPRISES ESSENTIALLY PASSING CURRENT IN THE RANGE OF 0.5 TO 8 AMPERES PER SQUARE INCH FROM AN ANODE TO SAID ARTICLE AS A CATHODE IMMERSED IN AN AQUEOUS CHROMIUM PLATING BATH AT A TEMPERATURE OF 140*F. TO THE BOILING POINT OF THE BATH, SAID BATH COMPRISING ESSENTIALLY 200 TO 900 G./. CRO3 AT LEAST ONE SOLUBLE SULFATE-CONTAINING COMPOUND IN AN AMOUNT SUFFICIENT TO PRODUCE A CONCENTRATION OF 0.3 TO 5.5 G./1. OF DISSOLVED SULFATE (SO4=) AND AT LEAST ONE SOLUBLE SILICOFLUORIDE-CONTAINING COMPOUND IN AN AMOUNT SUFFICIENT TO PRODUCE A CONCENTRATION OF 1.0 TO 11.4 G./1. OF DISSOLVED SILICOFLUORIDE (DIF6=), SAID BATH BEING FREE OF COMPOUNDS ACTING TO SUPPRESS THE CONCENTRATIONS OF DISSOLVED SULFATE AND SILICOFLUORIDE, THE SUM OF SAID DISSOLVED SULFATE AND SILICOFLUORIDE BEING IN THE RANGE OF 1.5 TO 11.7 G./1., AND SAID SUM OF DISSOLVED SULFATE AND SILICOFLUORIDE VARYING WITH THE CRO3 CONCENTRATION IN THE MANNER DEFINED BY THE AREA ABCD OF THE GRAPH SHOWN IN THE ACCOMPANYING DRAWING.
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) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |