US3023461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for extruding plastic materials
Assignee: OI Glass Inc
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Filing: 1958-11-07
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Granted: 1962-03-06
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Expires: 1978-11-07
Abstract
No abstract record available.
Inventors
- 👤 Orville B Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/30; B29C48/32; B29C48/325; Y; Y10; Y10S; Y10S264/00; Y10S264/33
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
A PROCESS FOR MANUFACTURING HALLOW PLASTIC ARTICLES HAVING LAMINATED WALL PORTIONS WHEREIN THE SPACING OF SUCH LAMINATION VARIES FROM ZERO TO A DESIRED MAXIMUM, COMPRISING THE STEPS OF: CONCURRENTLY ESTRUDING HEATED THERMOPLASTIC MATERIAL THROUGH ANNULAR CONCENTRIC ORIFICES SPACED APART SUFFICIENTLY TO PROVIDE THE DESIRED MAXIMUM LAMINATION SPACING, EACH ORIFICE BEING DEFINED BY RADIALLY SPACED INNER AND OUTER CIRCULAR EDGES; AND DURING EXTRUSION PERIODICALLY AXIALLY SHIFTING THE INNER EDGE OF AT LEAST ONE ORIFICE WITH RESPECT TO THE OUTER EDGE OF THE SAME ORIFICE IN THE DIRECTION TO CAUSE THE TUBULAR THERMOPLASTIC MATERIAL ISSUING THROUGH SUCH ORIFICE TO BE RADIALLY DEFLECTED INTO CONTACT WITH THE TUBULAR THERMOPLASTIC MATERIAL ISSUING FROM THE OUTER ORIFICE.
References Cited (Backward Citations)
US2574555A
Cited
FR1025834A
Cited
US2750625A
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US2632202A
Cited
US2781551A
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US2710987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |