US3920525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for continuously anodizing aluminum
Assignee: Individual
•
Filing: 1974-12-11
•
Granted: 1975-11-18
•
Expires: 1994-12-11
Abstract
Abstract Aluminum is continuously anodized using direct current in an anodizing cell which is preceeded by a cathodic contact cell having an anode connected to a source of direct current. The aluminum already has an anodized oxide coating formed thereon before entering the contact cell and direct current is introduced into the already anodized aluminum in the contact cell for further anodizing the already anodized aluminum.
Inventors
- 👤 Howard A Fromson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:26
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
IN A PROCESS FOR CONTINUOUSLY ELECTROLYTICALLY ANODIZING ALUMINUM, THE IMPROVEMENT WHICH COMPRISES INTRODUCING ANODIZING DIRECT CURRENT INTO SAID ALUMINUM IN A CATHODIC CONTACT CELL, SAID ALUMINUM HAVING AN ANODIZED OXIDE COATING FORMED THEREON BEFORE ENTERING SAID CELL.
Claim 2
Dependent Claim
37 words
IN A PROCESS FOR CONTINUOUSLY ELECTROLYTICALLY ANODIZING ALUMINUM, THE IMPROVEMENT WHICH COMPRISES INTRODUCING ANODIZING DIRECT CURRENT INTO SAID ALUMINUM IN A CATHODIC CONTACT CELL, SAID ALUMINUM HAVING AN ANODIZED OXIDE COATING FORMED THEREON BEFORE ENTERING SAID CELL.
Claim 3
Dependent Claim
71 words
Process for continuously electrolytically anodizing an already anodized aluminum web comprises continuously passing said web through a cathodic contact cell having therein an anode connected to a source of direct current, continuously passing said web from said contact cell into an anodizing cell having therein a cathode connected to said source of direct current thereby introducing anodizing direct current into said web in said contact cell and further anodizing said web.
Claim 4
Dependent Claim
71 words
Process for continuously electrolytically anodizing an already anodized aluminum web comprises continuously passing said web through a cathodic contact cell having therein an anode connected to a source of direct current, continuously passing said web from said contact cell into an anodizing cell having therein a cathode connected to said source of direct current thereby introducing anodizing direct current into said web in said contact cell and further anodizing said web.
Claim 5
Dependent Claim
59 words
Process for further anodizing an anodized aluminum web which comprises passing said anodized web through a cathodic contact cell and an anodizing cell under conditions of temperature, time and electrolyte concentration such that the weight loss of the anodized web leaving the anodizing cell does not exceed 50% thereby increasing the weight of the anodized coating on said web.
Claim 6
Dependent Claim
59 words
Process for further anodizing an anodized aluminum web which comprises passing said anodized web through a cathodic contact cell and an anodizing cell under conditions of temperature, time and electrolyte concentration such that the weight loss of the anodized web leaving the anodizing cell does not exceed 50% thereby increasing the weight of the anodized coating on said web.
Claim 7
Dependent Claim
15 words
Process of claim 3 wherein the weight loss is from about 10 to about 15%.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |