US3929593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming colored oxide film on aluminum or aluminum alloy material
Assignee: Riken Light Metal Industry Co Ltd
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Filing: 1974-09-18
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Granted: 1975-12-30
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Expires: 1994-09-18
Abstract
Abstract A method of forming a colored oxide film on an aluminum or aluminum alloy material by electrolyzing the aluminum or aluminum alloy material used as one or each of the electrodes in an electrolytic bath containing a metallic salt while applying a pulse voltage consisting of a plurality of unipotential pulses whose polarity is reversed at every predetermined conduction time. The aluminum or aluminum alloy material may also be one that has an oxide film previously formed thereon.
Inventors
- 👤 Noboru Sugiyama
- 👤 Masahiro Takahashi
- 👤 Hirosuke Kanamori
- 👤 Ken Sato
- 👤 Yoshio Hirayama
- 👤 Masahiro Mikamo
- 👤 Toshiro Takahashi
- 👤 Toshihiro Nagano
- 👤 Kazuyoshi Kaneda
- 👤 Isao Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:43
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14; C25D11/18; C25D11/20; C25D11/22; Y; Y10; Y10S; Y10S204/00; Y10S204/08; Y10S204/09
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A METHOD OF FORMING A COLORED OXIDE FILM ON AN ALUMINUM MATERIAL BY ELECTROLYZING SAID ALUMINUM MATERIAL IN AN AQUEOUS ELECTROLYTIC BATH CONTAINING A METALLIC SALT BY SUPPLYING SAID ALUMINUM MATERIAL SERVING AS EACH ELECTRODE WITH A PULSE VOLTAGE CONSISTING OF PLURALITY OF UNIPOTETIAL PULSES WHOSE POLARITY IS INVERTED AFTER EVERY PREDETERMINDE CONDUCTION TIME.
Claim 2
Independent Claim
54 words
A METHOD OF FORMING A COLORED OXIDE FILM ON AN ALUMINUM MATERIAL BY ELECTROLYZING SAID ALUMINUM MATERIAL IN AN AQUEOUS ELECTROLYTIC BATH CONTAINING A METALLIC SALT BY SUPPLYING SAID ALUMINUM MATERIAL SERVING AS EACH ELECTRODE WITH A PULSE VOLTAGE CONSISTING OF PLURALITY OF UNIPOTETIAL PULSES WHOSE POLARITY IS INVERTED AFTER EVERY PREDETERMINDE CONDUCTION TIME.
Claim 3
Dependent Claim
17 words
The method according to claim 1, wherein said aluminum material has an oxide film previously formed thereon.
Claim 4
Dependent Claim
26 words
THE METHOD ACCORDING TO CLAIM 1, WHEREIN SAID ALUMINUM MATERIAL IS ELECTROLYZED BY APPLYING A PULSE VOLTAGE WHOSE POSITIVE AND NEGATIVE PULSE WAVEFORMS ARE RETANGULAR ONES.
Claim 5
Dependent Claim
25 words
The method according to claim 1, wherein said aluminum material is electrolyzed by applying a pulse voltage which is obtained by phase-controlling an AC wave.
Claim 6
Dependent Claim
22 words
The method according to claim 1, wherein said aluminum material is electrolyzed in an aqueous sulfuric acid solution containing a metallic salt.
Claim 7
Dependent Claim
22 words
The method according to claim 3, wherein said aluminum material is electrolyzed in an aqueous sulfuric acid solution containing a metallic salt.
Claim 8
Dependent Claim
22 words
The method according to claim 4, wherein said aluminum material is electrolyzed in an aqueous sulfuric acid solution containing a metallic salt.
Claim 9
Dependent Claim
16 words
The method according to claim 3, wherein the positive and negative pulse wave forms are symmetrical.
Claim 10
Dependent Claim
15 words
The method according to claim 6, wherein the positive and negative pulse waveforms are symmetrical.
Claim 11
Dependent Claim
45 words
The method according to claim 3, wherein said aluminum material is electrolyzed by applying a rectangular pulse voltage which is obtained by rectifying AC and whose pulse intervals of the positive and negative pulse waveforms are determined based on the unit period of said AC.
Claim 12
Dependent Claim
45 words
The method according to claim 6, wherein said aluminum material Is electrolyzed by applying a rectangular pulse voltage which is obtained by rectifying AC and whose pulse intervals of the positive and negative pulse waveforms are determined based on the unit period of said AC.
Claim 13
Dependent Claim
30 words
The method according to claim 3, wherein the ratio of the unit pulse period to the pulse duration and the peak value of said pulse voltage are independently selectively controlled.
Claim 14
Dependent Claim
35 words
The method according to claim 3, wherein the pulse duration of the positive rectangular pulse voltage and that of the negative rectangular pulse voltage are controlled to be 10 X 10 3 sec. or longer.
Claim 15
Dependent Claim
46 words
The method according to claim 3, wherein the time for the positive rectangular pulse voltage and the negative rectangular pulse voltage to fall to the value of 1/4 of its peak voltage value is selected to be 1/3 of the pulse interval or shorter than it.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |