US3608013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically patterned material
Assignee: Acordis UK Ltd
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Filing: 1968-10-08
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Granted: 1971-09-21
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Expires: 1988-10-08
Abstract
Abstract A method of making an optically patterned material comprising urging a molten translucent or transparent matrix polymer through a plurality of constrictions and intermittently injecting a visibly different molten polymer composition into at least some of the constrictions, thereby interrupting the flow of the matrix polymer composition therethrough, allowing the matrix polymer composition to purge the constrictions of the injected composition at the conclusion of each injection and combining and shaping the polymer composition streams emerging from the constrictions. Apparatus for making such optically patterned material is also described.
Inventors
- 👤 Raymond G Ingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:36
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/16; B29C48/17; B29C48/175; B29C48/03; B29C48/06; B29C48/07; B29C48/08; B29C48/18; B29C48/19; B29C48/20; B29C48/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A method as claimed in claim 1 for making an optically patterned sheet, comprising forming parallel laminar streams of the translucent or transparent matrix polymer on either side of the streams emerging from the flow channels, combining all the streams in one laminated sheet of molten polymer and spreading the sheet to form a thinner laminated sheet.
Claim 2
Dependent Claim
22 words
A method as claimed in claim 2 in which the matrix polymer composition and the injected polymer composition have similar polymer components.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 3 for the production of tortoiseshell in which the polymer component of both polymer compositions is secondary cellulose acetate.
Claim 4
Dependent Claim
98 words
Apparatus for making an optically patterned material from at least two visibly different polymer compositions, comprising a barrier having a plurality of flow channels extending therethrough, means continuously to urge a molten matrix polymer composition through the flow channels, means to inject intermittently a molten, visibly different polymer composition into less than all of the flow channels against the pressure exerted by the matrix polymer composition, a duct at the output side of the barrier in which the streams of polymer composition issuing from the flow channels may combine, and a die closing the outlet from the duct.
Claim 5
Dependent Claim
35 words
Apparatus as claimed in claim 5 in which the means to inject the polymer composition, is a manifold connection to the orifices and a pump adapted intermittently to urge the polymer composition through the manifold.
Claim 6
Dependent Claim
52 words
Apparatus as claimed in claim 6 in which the barrier is additionally perforated by parallel slits on either side of a likewise parallel, linear array of the orifices, and through which the matrix polymer may flow uninterruptedly, and the width of the duct becomes progressively broader from the barrier to the die.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |