US4091954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum container having interior surface treated to suppress foaming and method therefor
Assignee: Alcoa Corp
•
Filing: 1977-06-02
•
Granted: 1978-05-30
•
Expires: 1997-06-02
Abstract
Abstract An aluminum container has an inner surface treated to suppress foaming of carbonated liquids subsequently placed therein by first chemically cleaning the aluminum surface, forming a conversion coating on the surface using a solution containing ions of phosphate, hexavalent chromium and fluoride; and treating the coated aluminum surface with an aqueous solution containing glycerol.
Inventors
- 👤 Paul F. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:12
CPC Classifications
B; B65; B65D; B65D25/00; B65D25/14; C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; Y; Y10; Y10T; Y10T428/00; Y10T428/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
An aluminum container having an inner surface treated by first chemically cleaning the inner surface, then reacting the inner surface with a solution containing ions of phosphate, hexavalent chromium, and fluoride to form a conversion coating on the aluminum, and finally treating the conversion coated aluminum surface with an aqueous solution containing glycerol such that the inner surface is provided with a glycerol coating which will suppress foaming of carbonated liquids subsequently placed in said container.
Claim 2
Dependent Claim
76 words
An aluminum container having an inner surface treated by first chemically cleaning the inner surface, then reacting the inner surface with a solution containing ions of phosphate, hexavalent chromium, and fluoride to form a conversion coating on the aluminum, and finally treating the conversion coated aluminum surface with an aqueous solution containing glycerol such that the inner surface is provided with a glycerol coating which will suppress foaming of carbonated liquids subsequently placed in said container.
Claim 3
Dependent Claim
16 words
The container of claim 1 wherein the aqueous solution contains at least 1% by volume glycerol.
Claim 4
Dependent Claim
34 words
The container of claim 2 wherein the aqueous solution of glycerol is applied to the inner surface of the aluminum container at room temperature for a period of from 10 seconds to 2 minutes.
Claim 5
Dependent Claim
18 words
The container of claim 3 wherein the conversion coating thickness ranges from 215-375 milligrams per meter 2 .
Claim 6
Dependent Claim
99 words
A process for treating the inner surface of an aluminum container to provide a protective coating thereon which will suppress foaming of carbonated liquids subsequently placed therein which comprises: (a) chemically cleaning the inner surface of the container; (b) reacting the inner surface with a solution containing ions of phosphate, hexavalent chromium, and fluoride to form a conversion coating on the aluminum; and (c) treating the conversion coated aluminum surface with an aqueous solution containing glycerol such that the inner surface is provided with a glycerol coating which will suppress foaming of carbonated liquids subsequently placed in said container.
Claim 7
Dependent Claim
99 words
A process for treating the inner surface of an aluminum container to provide a protective coating thereon which will suppress foaming of carbonated liquids subsequently placed therein which comprises: (a) chemically cleaning the inner surface of the container; (b) reacting the inner surface with a solution containing ions of phosphate, hexavalent chromium, and fluoride to form a conversion coating on the aluminum; and (c) treating the conversion coated aluminum surface with an aqueous solution containing glycerol such that the inner surface is provided with a glycerol coating which will suppress foaming of carbonated liquids subsequently placed in said container.
References Cited (Backward Citations)
US3706604A
Cited
US3912548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |