Patent US3520194A successfully refreshed from Google Patents.
Patent US3900538A successfully refreshed from Google Patents.
US3900538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for surface treatment of plastics
Assignee: Toray Industries Inc
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Filing: 1973-02-13
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Granted: 1975-08-19
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Expires: 1993-02-13
Abstract
Abstract The present invention relates to a method and apparatus for the production of plastic materials having improved surface bonding properties for bonding other materials to the plastic materials. The new method comprises passing the plastic material through an electrically charged flame. The apparatus used to perform the method may have several embodiments which include an electrical power supply circuit, a discharge electrode, a burner, and a chill-roller for supporting the plastic material.
Inventors
- 👤 Ken-Ichi Kawakami
- 👤 Kenji Hatada
- 👤 Yasuhiko Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
A METHOD FOR THE PRODUCTION OF PLASTIC MATERIALS HAVING IMPROVED SURFACE-BONDING PROPERTIES WHICH COMPRISES PASSING THE PLASTIC MATERIAL THROUGH AN ELECTRICALLY CHARGED FLAME, SAID FLAME BEING CONTINUOUS AND ELECTRICALLY CHARGED TO CREAT A CORONA IN THE PRESENCE OF ACTIVATED IONS MOVING THROUGH THE FLAME AND IMPINGING UPON THE SURFACE OF THE PLASTIC MATERIAL.
Claim 2
Independent Claim
53 words
A METHOD FOR THE PRODUCTION OF PLASTIC MATERIALS HAVING IMPROVED SURFACE-BONDING PROPERTIES WHICH COMPRISES PASSING THE PLASTIC MATERIAL THROUGH AN ELECTRICALLY CHARGED FLAME, SAID FLAME BEING CONTINUOUS AND ELECTRICALLY CHARGED TO CREAT A CORONA IN THE PRESENCE OF ACTIVATED IONS MOVING THROUGH THE FLAME AND IMPINGING UPON THE SURFACE OF THE PLASTIC MATERIAL.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the flame is charged by a voltage in the range from 100-V to 20-KV.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the ions impinging upon the surface are positive ions.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the ions impinging upon the surface are electrons.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein the voltage is alternating.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the plastic material is in the form of a film.
Claim 8
Dependent Claim
18 words
The method of claim 6 wherein one surface of the film is exposed to the electrically charged flame.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein the flame is charged by a voltage in the range from 100-V to 20-KV.
Claim 10
Dependent Claim
14 words
The method of claim 8 wherein the voltage range is from 100-V to 4-KV.
Claim 11
Dependent Claim
10 words
The method of claim 8 wherein the voltage is positive.
Claim 12
Dependent Claim
10 words
The method of claim 8 wherein the voltage is negative.
Claim 13
Dependent Claim
10 words
The method of claim 8 wherein the voltage is alternating.
References Cited (Backward Citations)
US2632921A
Cited
US2910723A
Cited
US2795820A
Cited
US2859480A
Cited
US2881470A
Cited
US3415683A
Cited
US3619242A
Cited
US3590107A
Cited
US3703569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |