Patent US3706636A successfully refreshed from Google Patents.
US3706636A
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US
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Preparing plating bath containing chromic compound
Assignee: Mcgean Rohco Inc
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Filing: 1971-02-19
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Granted: 1972-12-19
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Expires: 1991-02-19
Abstract
Abstract A bright decorative chromium plate of good appearance and durability is electrodeposited from a bath prepared from a solution containing trivalent chromic-compound. More particularly the bath is made from a preformed complex, or such complex is made in situ, and is a water-soluble trivalent chromic compound containing carboxylic acid constituents and halogen constituents. The prepared bath provides for excellent plating speed in the low current density region thus offering enhanced chromium thickness in recessed and difficult to plate areas.
Inventors
- 👤 John Edwin Bride
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:12
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/06
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
24 words
permitting reaction of the substituents in said medium, thereby preparing therein a complex, water-soluble trivalent chromic compound containing carboxylic acid constituents and halogen constituents;
Claim 2
Dependent Claim
24 words
permitting reaction of the substituents in said medium, thereby preparing therein a complex water-soluble trivalent chromic compound containing carboxylic acid constituents and halogen constituents;
Claim 3
Dependent Claim
24 words
permitting reaction of the substituents in said medium, thereby preparing therein a complex, water-soluble trivalent chromic compound containing carboxylic acid constituents and halogen constituents;
Claim 4
Dependent Claim
39 words
The method of claim 1 wherein said medium is furnished with between about 10-70 grams per liter of substance selected from the group consisting of boric acid, a substance supplying boric acid equivalent in aqueous solution, and mixtures thereof.
Claim 5
Dependent Claim
17 words
adjusting the pH of said medium within a range of between about 1.8 and about 4.9; while
Claim 6
Dependent Claim
13 words
maintaining the temperature of said medium not substantially in excess of about 50*C.
Claim 7
Dependent Claim
24 words
adjusting the concentration of said complex in said medium to supply not substantially above about 150 grams of chromium per liter of the medium;
Claim 8
Dependent Claim
34 words
The method of claim 1 wherein said medium is furnished with between about 50-200 grams per liter of a salt of a strong acid having a dissociation constant of at least K 10 2.
Claim 9
Dependent Claim
24 words
adjusting the concentration of said complex in said medium to Supply not substantially above about 150 grams of chromium per liter of the medium;
Claim 10
Dependent Claim
24 words
adjusting the concentration of said complex in said medium to supply not substantially above about 150 grams of chromium per liter of the medium;
Claim 11
Dependent Claim
17 words
adjusting the pH of sad medium within a range of between about 1.8 and about 4.9; and
Claim 12
Dependent Claim
17 words
adjusting the pH of said medium within a range of between about 1.8 and about 4.9; and
Claim 13
Independent Claim
22 words
The method of preparing an aqueous electrolytic plating bath for the plating of bright chromium plate from trivalent-chromic compound, which method comprises:
Claim 14
Dependent Claim
17 words
adjusting the pH of said medium within a range of between about 1.8 and about 4.9; and
Claim 15
Dependent Claim
30 words
The process of claim 4 wherein said halogen providing compound is selected from the group consisting of hydrogen fluoride, sodium fluosilicate, fluorine gas, hydrogen chloride, chlorine gas, and mixtures thereof.
Claim 16
Dependent Claim
9 words
maintaining the temperature of said medium below about 50*C.
Claim 17
Dependent Claim
9 words
maintaining the temperature of said medium below about 50*C.
Claim 18
Dependent Claim
38 words
maintaining the temperature of said medium below about 50*C. 15 The process of claim 14 wherein said reaction medium additionally contains a strong base yielding hydroxyl ions in said aqueous reaction medium when said chromic halide is present.
Claim 19
Dependent Claim
39 words
The method of claim 4 wherein said medium is furnished with between about 10-70 grams per liter of substance selected from the group consisting of boric acid, a substance supplying boric acid equivalent in aqueous solution, and mixtures thereof.
Claim 20
Dependent Claim
34 words
The method of claim 4 wherein said medium is furnished with between about 50-200 grams per liter of a salt of a strong acid having a dissociation constant of at least K 10 2.
Claim 21
Dependent Claim
32 words
The process of claim 4 wherein water supplies all of the liquid of said reaction medium, such medium is heated to boiling during reaction, and said chromium metal is in pulverulent form.
Claim 22
Dependent Claim
22 words
The process of preparing an aqueous electrolytic plating bath for the plating of bright chromium plate from trivalent-chromic compound, which process comprises:
Claim 23
Dependent Claim
26 words
The process of claim 9 further characterized by a liquid reaction medium containing fugitive liquid that is at least substantially volatized after preparation of said complex.
Claim 24
Dependent Claim
29 words
The process of claim 9 wherein said halogen-providing compound is selected from the group consisting of hydrogen fluoride, sodium fluosilicate, fluorine gas, hydrogen chloride, chlorine gas, and mixtures thereof.
Claim 25
Dependent Claim
39 words
The method of claim 9 wherein said medium is furnished with between about 10-70 grams per liter of substance selected from the group consisting of boric acid, a substance supplying boric acid equivalent in aqueous solution, and mixtures thereof.
Claim 26
Dependent Claim
34 words
The method of claim 9 wherein said medium is furnished with between about 50-200 grams per liter of a salt of a strong acid having a dissociation constant of at least K 10 2.
Claim 27
Dependent Claim
23 words
The process of preparing an aqueous electrolytic plating bath for the plating of bright chromium plate from trivalent chromic compound, which process comprises:
Claim 28
Dependent Claim
39 words
The method of claim 14 wherein said medium is furnished with between about 10-70 grams per liter of substance selected from the group consisting of boric acid, a substance supplying boric acid equivalent in aqueous solution, and mixtures thereof.
Claim 29
Dependent Claim
34 words
The method of claim 14 wherein said medium is furnished with between about 50-200 grams per liter of a salt of a strong acid having a dissociation constant of at least K 10 2.
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |