Patent US811757A successfully refreshed from Google Patents.
Patent US3846170A successfully refreshed from Google Patents.
US3846170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming electrically insulating chemical conversion coating on aluminum wires
Assignee: Fujikura Ltd
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Filing: 1972-09-11
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Granted: 1974-11-05
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Expires: 1992-09-11
Abstract
Abstract 1. A METHOD OF FORMING AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE SURFACES OF ALUMINUM OR ALUMINUM ALLOY WIRES WHICH COMPRISES PASSING THE WIRES OF ALUMINUM OR AN ALUMINUM ALLOY THROUGH A CHEMICAL CONVERSION TREATING SOLUTION HELD AT 80 TO 110* C. CONTAINING SODIUM CARBONATE AND SODIUM CHROMATE IN A CONCENTRATION OF 20 TO 200 GRAMS PER LITER OF WATER AND IN WHICH THE WEIGHT RATIO OF SODIUM CARBONATE TO SODIUM CHROMATE RANGES FROM 10:5 TO 10:10 TO FORM AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE WIRES.
Inventors
- 👤 K Isawa
- 👤 M Maejima
- 👤 K Kiuchi
- 👤 K Yokota
- 👤 M Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:51
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66; C23C22/67
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF FORMING AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE SURFACES OF ALUMINUM OR ALUMINUM ALLOY WIRES WHICH COMPRISES PASSING THE WIRES OF ALUMINUM OR AN ALUMINUM ALLOY THROUGH A CHEMICAL CONVERSION TREATING SOLUTION HELD AT 80 TO 110* C. CONTAINING SODIUM CARBONATE AND SODIUM CHROMATE IN A CONCENTRATION OF 20 TO 200 GRAMS PER LITER OF WATER AND IN WHICH THE WEIGHT RATIO OF SODIUM CARBONATE TO SODIUM CHROMATE RANGES FROM 10:5 TO 10:10 TO FORM AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE WIRES.
Claim 2
Independent Claim
94 words
A METHOD OF FORMING AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE SURFACES OF ALUMINUM OR ALUMINUM ALLOY WIRES WHICH COMPRISES PASSING THE WIRES OF ALUMINUM OR AN ALUMINUM ALLOY THROUGH A CHEMICAL CONVERSION TREATING SOLUTION HELD AT 80 TO 110* C. CONTAINING SODIUM CARBONATE AND SODIUM CHROMATE IN A CONCENTRATION OF 20 TO 200 GRAMS PER LITER OF WATER AND IN WHICH THE WEIGHT RATIO OF SODIUM CARBONATE TO SODIUM CHROMATE RANGES FROM 10:5 TO 10:10 TO FORM AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE WIRES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |