Patent US3663325A successfully refreshed from Google Patents.
US3663325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treating method for moldings of polystyrene type resins
Assignee: Resonac Holdings Corp
•
Filing: 1970-06-11
•
Granted: 1972-05-16
•
Expires: 1990-06-11
Abstract
Abstract A surface treating method for moldings of polystyrene type resins wherein there is dispersed in water a solvent selected from the group consisting of aromatic hydrocarbons, chlorinated hydrocarbons, cycloaliphatic hydrocarbons, ketones and esters using a surface active agent to form an aqueous emulsion containing 0.2 to 30 percent by weight of the solvent; the aqueous emulsion is brought into contact with moldings of polystyrene type resin for treatment of their surfaces; the treated surface of the moldings is further chemically etched using a mixed solution of sulfuric acid and dichromic acid; and, if required, the surface is again treated by heated concentrated sulfuric acid.
Inventors
- 👤 Kiminori Uda
- 👤 Hiroya Yamamoto
- 👤 Naoatu Kasuga
- 👤 Kenzi Fuziyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:48
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/22; C23C18/24; C23C18/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
A method according to claim 1 wherein the treated surface of moldings of polystyrene type resins is further treated by heated concentrated sulfuric acid having a concentration of more than 93 percent.
Claim 2
Dependent Claim
28 words
A method according to claim 1 wherein there is incorporated in said polystyrene type resins an additive selected from the group consisting of inorganic fillers and chlorinated polyolefins.
Claim 3
Dependent Claim
28 words
A method according to claim 2 wherein there is incorporated in said polystyrene type resins an additive selected from the group consisting of inorganic fillers and chlorinated polyolefins.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein the polystyrene type resin is selected from the group consisting of general purpose polystyrene, acrylonitrile-styrene copolymers, high impact polystyrene, and acrylonitrile-butadiene-styrene interpolymers.
Claim 5
Dependent Claim
29 words
A method according to claim 2 wherein the polystyrene type resin is selected from the group consisting of general purpose polystyrene, acrylonitrile-styrene copolymers, high impact polystyrene, and acrylonitrile-butadiene-styrene interpolymers.
Claim 6
Dependent Claim
29 words
A method according to claim 3 wherein the polystyrene type resin is selected from the group consisting of general purpose polystyrene, acrylonitrile-styrene copolymers, high impact polystyrene, and acrylonitrile-butadiene-styrene interpolymers.
Claim 7
Dependent Claim
29 words
A method according to claim 4 wherein the polystyrene type resin is selected from the group consisting of general purpose polystyrene, acrylonitrile-styrene copolymers, high impact polystyrene, and acrylonitrile-butadiene-styrene interpolymers.
Claim 8
Dependent Claim
25 words
A method according to claim 1 wherein the solvent is selected from the group consisting of xylene, monochlorobenzene, cyclohexane, methyl ethyl ketone and butyl acetate.
Claim 9
Dependent Claim
25 words
A method according to claim 2 wherein the solvent is selected from the group consisting of xylene, monochlorobenzen, cyclohexane, methyl ethyl ketone and butyl acetate.
Claim 10
Dependent Claim
25 words
A method according to claim 3 wherein the solvent is selected from the group consisting of xylene, monochlorobenzen, cyclohexane, methyl ethyl ketone and butyl acetate.
Claim 11
Dependent Claim
25 words
A method according to claim 4 wherein the solvent is selected from the group consisting of xylene, monochlorobenzene, cyclohexane, methyl ethyl ketone and butyl acetate.
References Cited (Backward Citations)
US2142968A
Cited
US2304632A
Cited
US3091553A
Cited
US3434588A
Cited
US3443008A
Cited
US3484270A
Cited
US3515649A
Cited
US3567594A
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 |