US3617338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a latent striated effect on plastic films
Assignee: Dow Chemical Co
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Filing: 1969-10-20
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Granted: 1971-11-02
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Expires: 1989-10-20
Abstract
Abstract A process and apparatus for the rapid vapor phase sulfonation of plastic films wherein the film is treated with a jet of a gas containing sulfur trioxide to achieve a latent striated effect. Subsequent dyeing of the treated film with water soluble dyes produces an attractively decorated, distinctive film useful as a wrapping material for edible and nonedible consumer goods.
Inventors
- 👤 Robert J Caiola
- 👤 Carl E Dewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:22
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; B; B44; B44F; B44F1/00; B44F1/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
24 words
The method as set forth in claim 1 in which is included the step of drying the plastic film prior to the sulfonation step.
Claim 2
Dependent Claim
28 words
The method as set forth in claim 1 in which the jet of gas containing sulfur trioxide has a flow rate greater than about 10 feet per second.
Claim 3
Dependent Claim
31 words
The method as set forth in claim 1 in which the jet of gas containing sulfur trioxide has a flow rate ranging from about 100 to about 200 feet per second.
Claim 4
Dependent Claim
24 words
The method as set forth in claim 1 in which said film is contacted with a plurality of said jets which are laterally spaced.
Claim 5
Dependent Claim
23 words
The method as set forth in claim 1 in which both sides of said film are contracted with at least one said jet.
Claim 6
Dependent Claim
27 words
The method as set forth in claim 1 in which both sides of said film are contacted with a plurality of said jets which are laterally spaced.
Claim 7
Dependent Claim
33 words
The method as set forth in claim 1 in which said film has been previously surface sulfonated completely on one side and the opposite side is contacted with at least one said jet.
Claim 8
Dependent Claim
22 words
The method of claim 8 in which said opposite side is contacted with a plurality of said jets which are laterally spaced.
References Cited (Backward Citations)
US2400720A
Cited
US2989363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |