US3758332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of metal coating an epoxy surface
Assignee: AT&T Inc
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Filing: 1971-08-20
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Granted: 1973-09-11
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Expires: 1991-08-20
Abstract
Abstract A METHOD OF IMPROVING ADHESIVE PROPERTIES OF A CURED EPOXY SURFACE RESULTING FROM CURING AN UNCURED BISPHENOL A-EPICHLOROHYDRIN EPOXY IS DISCLOSED. THE METHOD COMPRISES EXPOSING THE CURED EPOXY SURFACETO A SUITABLE SWELLANT TO SWELL THE SURFACE. SOME TYPICAL SUITABLE SWELLANTS ARE METHYL ETHYL KETONE, TETRAHYDROFURAN, DIOXANE, PYRIDINE, DIMETHYLFORMAMIDE AND A MIXTURE OF METHYL ETHYL KETONE, ETHYL ALCOHOL AND METHYL ALCOHOL. THE SWELLED SURFACE IS THEN EXPOSED TO A SUITABLE ACIDIC ETCHING SOLUTION COMPRISING H2SO4, H2PO4 AND CR+6 IONS, TO ETCH THE SURFACE.
Inventors
- 👤 D Dinella
- 👤 J Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:36
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; C08J7/12; C08J7/14; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/2006; C23C18/2026; C23C18/2033; C23C18/2046; C23C18/2073; C23C18/2086; C23C18/28; C23C18/285; C23C18/30; H; H05; H05K; H05K3/00; H05K3/38; H05K3/381; C08J2363/00
Claims Analysis
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |