US3663404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of electrodeposition bath
Assignee: PPG Industries Inc
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Filing: 1970-12-01
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Granted: 1972-05-16
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Expires: 1990-12-01
Abstract
Abstract This invention relates to a method of rinsing articles coated by an electrodeposition process which comprises employing as at least a portion of the rinsing agent the effluent obtained from a selective separation process such as an ultrafiltration process, while withdrawing a portion of said effluent which contains excess and/or undesirable low molecular weight species present in the electrodepositable composition, thereby, first, conserving bath material and, second, controlling the composition of the electrodepositable composition.
Inventors
- 👤 Frederick M Loop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:54
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; B01D61/14; B01D61/145; C; C25; C25D; C25D13/00; C25D13/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A method as in claim 1 wherein the ultrafiltration process is operated at a pressure gradient between about 10 and about 150 p.s.i. and the ultrafiltration membrane has a flux rate of at least about 4.5 gallons per square foot per day.
Claim 2
Dependent Claim
28 words
A method as in claim 1 wherein the effluent is proportionately utilized as a rinsing agent while removing at least a portion of said effluent from the system.
Claim 3
Dependent Claim
22 words
A method as in claim 3 wherein the portion of the effluent utilized as rinsing agent is admixed with additional rinsing agent.
Claim 4
Dependent Claim
28 words
A method as in claim 1 wherein the effluent is intermittently utilized as rinsing agent while intermittently removing at least a portion of said effluent from the system.
Claim 5
Dependent Claim
22 words
A method as in claim 5 wherein the portion of the effluent utilized as rinsing agent is admixed with additional rinsing agent.
Claim 6
Dependent Claim
41 words
A method as in claim 5 wherein the ultrafiltration process is operated at a pressure gradient between about 25 and about 75 p.s.i., and the ultrafiltration membrane has a flux rate of at least 4.5 gallons per square foot per day.
Claim 7
Independent Claim
123 words
A method of operating an electrodeposition process wherein electrically conductive substrate is electrocoated from an aqueous electrodeposition bath and subsequently rinsed with a rinsing agent to remove dragout comprising subjecting at least a portion of said aqueous electrodeposition bath comprising ionically solubilized synthetic resin, to an ultrafiltration process wherein an ultrafiltration membrane passes an aqueous effluent comprising water and solute of substantially lower molecular weight than the solubilized resin, while retaining said solubilized resin, and utilizing at least a portion of said effluent as at least a portion of the rinsing agent in the electrodeposition process in a manner that said rinsing agent, after use, returns to the electrodeposition bath while continuously or intermittently removing a portion of said effluent from the system.
Claim 8
Dependent Claim
41 words
A method as in claim 8 wherein the ultrafiltration process is operated at a pressure gradient between about 25 and about 75 p.s.i., and the ultrafiltration membrane has a flux rate of at least 4.5 gallons per square foot per day.
Claim 9
Dependent Claim
26 words
A method as in claim 8 wherein at least a portion of the effluent is continuously utilized as at least a portion of the rinsing agent.
References Cited (Backward Citations)
GB1071458A
Cited
US3556970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |