US3976797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low corrosion azo colorants
Assignee: Dynapol Shareholders Liquidating Trust
•
Filing: 1975-03-10
•
Granted: 1976-08-24
•
Expires: 1995-03-10
Abstract
Abstract Azo colorants, when employed in polymeric form, present substantially reduced corrosivity to metals.
Inventors
- 👤 Thomas E. Furia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/10; C09B69/106; A; A23; A23L; A23L5/00; A23L5/40; A23L5/42; A23L5/47; Y; Y10; Y10S; Y10S534/00; Y10S534/03
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
34 words
The combination of a surface comprising a metal subject to corrosive chemical attack by nonpolymeric azo dyes in confining or retaining contact with a material containing a coloring amount of a polymeric azo dye.
Claim 2
Dependent Claim
34 words
The combination of a surface comprising a metal subject to corrosive chemical attack by nonpolymeric azo dyes in confining or retaining contact with a material containing a coloring amount of a polymeric azo dye.
Claim 3
Dependent Claim
18 words
The combination of claim 1, wherein said metal subject to corrosive chemical attack by azo dyes is steel.
Claim 4
Dependent Claim
18 words
The combination of claim 1, wherein said metal subject to corrosive chemical attack by azo dyes is aluminum.
Claim 5
Dependent Claim
34 words
The combination of claim 1, wherein said material is selected from the group consisting of foods and beverages and said surface is a surface of a steel container which confines or retains said material.
Claim 6
Dependent Claim
12 words
The combination of claim 4, wherein said steel container is a can.
Claim 7
Dependent Claim
26 words
The combination of claim 1, wherein said metal subject attack by azo dyes is selected from the group consisting of iron, aluminum, tin, zinc and nickel.
Claim 8
Dependent Claim
20 words
The combination of claim 2, wherein said surface is a surface of a container which confines or retains said material.
Claim 9
Dependent Claim
19 words
The combination of claim 6, wherein said material is selected from the groups consisting of foods, beverages, and pharmaceuticals.
Claim 10
Dependent Claim
20 words
The combination of claim 8, wherein said surface is a surface of a container which confines or retains said material.
Claim 11
Dependent Claim
51 words
In a system comprising a surface of a metal selected from the group consisting of iron, steel, zinc, tin, aluminum, and alloys thereof in retaining or confining contact with a material containing a coloring amount of an azo colorant, the improvement comprising employing a polymeric azo colorant as said azo colorant.
Claim 12
Dependent Claim
51 words
In a system comprising a surface of a metal selected from the group consisting of iron, steel, zinc, tin, aluminum, and alloys thereof in retaining or confining contact with a material containing a coloring amount of an azo colorant, the improvement comprising employing a polymeric azo colorant as said azo colorant.
Claim 13
Dependent Claim
19 words
The system of claim 10, wherein said material is selected from the group consisting of foods, beverages and pharmaceuticals.
Claim 14
Dependent Claim
43 words
The system of claim 10, wherein said polymeric azo colorant has the structure ##STR2## wherein Ch is azo chromophore, B is a nonchromophoric group to which the Ch groups are covalently bonded, and n is an integer of from 2 to 4000 inclusive.
Claim 15
Dependent Claim
43 words
The system of claim 10, wherein said polymeric azo colorant has the structure ##STR3## wherein Ch is azo chromophore, B is a nonchromophoric group to which the Ch groups are covalently bonded, and n is an integer of from 2 to 4000 inclusive.
Claim 16
Dependent Claim
18 words
The system of claim 13, wherein said material is selected from the group consisting of foods and beverages.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |