US4047969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron blue nacreous coated pigments
Assignee: Mearl Corp
•
Filing: 1976-10-05
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Granted: 1977-09-13
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Expires: 1996-10-05
Abstract
Abstract By addition of ferric ions to a ferrocyanide solution and adjustment of the pH, Iron Blue is directly precipitated and adheres to a mica or metal oxide coated mica substrate.
Inventors
- 👤 Louis Armanini
- 👤 Cordell E. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:45
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C09C1/26; C09C1/0015; C09C1/0021; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C09C2200/00; C09C2200/10; C09C2200/102; C09C2220/00; C09C2220/10; C09C2220/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A method for directly adhering Iron Blue to a mica or metal oxide coated mica substrate which comprises mixing said substrate with a soluble ferrocyanide and a soluble ferric compound in an aqueous medium such that there is at least 30% excess ferric ions based on the amount of ferric ion necessary to form Iron Blue, adjusting the pH to 3.5 to 5.5, recovering the resulting Iron Blue coated substrate and drying the recovered Iron Blue coated substrate at a temperature below the decomposition temperature of the Iron Blue.
Claim 2
Independent Claim
89 words
A method for directly adhering Iron Blue to a mica or metal oxide coated mica substrate which comprises mixing said substrate with a soluble ferrocyanide and a soluble ferric compound in an aqueous medium such that there is at least 30% excess ferric ions based on the amount of ferric ion necessary to form Iron Blue, adjusting the pH to 3.5 to 5.5, recovering the resulting Iron Blue coated substrate and drying the recovered Iron Blue coated substrate at a temperature below the decomposition temperature of the Iron Blue.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the amount of excess ferric ions is 30 to 50%.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said drying is effected at a temperature of 50 to 130° C.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said pH is adjusted to about 4 to 5.
Claim 6
Dependent Claim
37 words
The method of claim 1 wherein said excess ferric ions is 30 to 50%, said pH is adjusted to about 4 to 5, and said drying is effected at a temperature of about 50° to 130° C.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein said ferrocyanide is potassium hexacyanoferrate and said ferric compound is ferric chloride.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein said substrate is a titanium dioxide coated nacreous pigment.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein said titanium dioxide coated mica nacreous pigment has a top coat of ferric oxide.
Claim 10
Dependent Claim
41 words
The method of claim 8 wherein the amount of soluble ferrocyanide employed is such that the weight ratio of ferric oxide top coat to Iron Blue deposited thereon is about 2.7:1, whereby a pigment with a green adsorption color is obtained.
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein said ferrocyanide is potassium hexacyanoferrate and said ferric compound is ferric chloride.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |