US4544472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode coating and coated electrodes
Assignee: Minteq International Inc
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Filing: 1985-03-11
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Granted: 1985-10-01
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Expires: 2005-03-11
Abstract
Abstract Coating for carbon electrodes used as anodes in the electrolysis of aluminum are disclosed. The coatings are aqueous and contain zinc chloride and powdered alumina.
Inventors
- 👤 Frederick V. Reven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:15
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A coated carbon electrode used in the manufacture of aluminum, the coating consisting essentially of prior to drying in percentages by weight: a. 15-50% zinc chloride b. 5-25% powdered alumina c. 1-10% alkali metal hydroxide or carbonate d. 0.05-5% of a suspending agent consisting essentially of starch as synthetic water-soluble polymers and xanthan gums e. 0.05-5% surface active agent f. balance water.
Claim 2
Dependent Claim
62 words
A coated carbon electrode used in the manufacture of aluminum, the coating consisting essentially of prior to drying in percentages by weight: a. 15-50% zinc chloride b. 5-25% powdered alumina c. 1-10% alkali metal hydroxide or carbonate d. 0.05-5% of a suspending agent consisting essentially of starch as synthetic water-soluble polymers and xanthan gums e. 0.05-5% surface active agent f. balance water.
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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |