US2800447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of ph in electrodeposition of polytetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1954-10-11
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Granted: 1957-07-23
•
Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Harold Edward Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:00
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/22; C25D13/24; Y; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A PROCESS FOR CONTINUOUSLY DEPOSITING DISPERSED PARTICLES OF POLYTETRAFLUOPROETHYLENE FROM AN AQUEOUS DISPERSION THEREOF ONTO AN ANODIC METALLIC SUBSTRATE BY AN ELECTRODEPOSITION METHOD, COMPRISING A CURRENT OF ELECTRICITY THROUGH SAID DISPERSION AND SAID ANODIC SUBSTRATE WHICH METHOD NORMALLY CAUSES AN INCREASE IN THE ALKALINITY OF ELECTRODESPOSITION BATH AND AN INCREASE IN THE CONCENTRATION OF INTERFERING IONS AND THEREBY REDUCES THE CURRENT EFFICIENCY OF SAID ELECTRODEPOSITION METHOD AND PRODUCES NON-UNIFORM COATING ON SAID SUBSTRATE, THE IMPROVEMENT IN SAID METHOD COMPRISING CONTINUOUSLY REMOVING SAID AQUEOUS DISPERSION FROM THE ELECTRODEPOSITION CELL, CONTINUOUSLY PASSING SAID DISPERSION INTO CONTACT WITH A WEAK CARBOXYLIC ACID ION-EXCHANGE RESIN HAVING A PH OF 6.0 TO 8.0, MAINTAINING A CONTACT TIME SUFFICIENT FOR
Claim 2
Dependent Claim
115 words
IN A PROCESS FOR CONTINUOUSLY DEPOSITING DISPERSED PARTICLES OF POLYTETRAFLUOPROETHYLENE FROM AN AQUEOUS DISPERSION THEREOF ONTO AN ANODIC METALLIC SUBSTRATE BY AN ELECTRODEPOSITION METHOD, COMPRISING A CURRENT OF ELECTRICITY THROUGH SAID DISPERSION AND SAID ANODIC SUBSTRATE WHICH METHOD NORMALLY CAUSES AN INCREASE IN THE ALKALINITY OF ELECTRODESPOSITION BATH AND AN INCREASE IN THE CONCENTRATION OF INTERFERING IONS AND THEREBY REDUCES THE CURRENT EFFICIENCY OF SAID ELECTRODEPOSITION METHOD AND PRODUCES NON-UNIFORM COATING ON SAID SUBSTRATE, THE IMPROVEMENT IN SAID METHOD COMPRISING CONTINUOUSLY REMOVING SAID AQUEOUS DISPERSION FROM THE ELECTRODEPOSITION CELL, CONTINUOUSLY PASSING SAID DISPERSION INTO CONTACT WITH A WEAK CARBOXYLIC ACID ION-EXCHANGE RESIN HAVING A PH OF 6.0 TO 8.0, MAINTAINING A CONTACT TIME SUFFICIENT FOR
References Cited (Backward Citations)
US2478322A
Cited
GB691859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |