US3231655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of large slabs of plastic
Assignee: Phillips Petroleum Co
•
Filing: 1960-10-17
•
Granted: 1966-01-25
•
Expires: 1980-10-17
Abstract
No abstract record available.
Inventors
- 👤 Olaf E Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:14
CPC Classifications
B; B29; B29C; B29C39/00; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1788; Y10T156/1795
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A PROCESS FOR PRODUCING THICK SLABS OF AN EXTRUDABLE THERMOPLASTIC MATERIAL WHICH COMPRISES THE STEPS OF: (1) HEATING TO ITS SOFTENING TEMPERATURE A COMPLETE BROAD SURFACE OF A FIRST SHEET OF SAID MATERIAL WITH A STREAM OF HOT AIR BEGINNING ALONG AN ENTIRE EDGE THEREOF AND PROGRESSIVELY MOVING THE HEATING ZONE OVER THE ENTIRE SURFACE TO THE OPPOSITE EDGE;
Claim 2
Dependent Claim
59 words
A PROCESS FOR PRODUCING THICK SLABS OF AN EXTRUDABLE THERMOPLASTIC MATERIAL WHICH COMPRISES THE STEPS OF: (1) HEATING TO ITS SOFTENING TEMPERATURE A COMPLETE BROAD SURFACE OF A FIRST SHEET OF SAID MATERIAL WITH A STREAM OF HOT AIR BEGINNING ALONG AN ENTIRE EDGE THEREOF AND PROGRESSIVELY MOVING THE HEATING ZONE OVER THE ENTIRE SURFACE TO THE OPPOSITE EDGE;
Claim 3
Dependent Claim
91 words
SIMULTANEOUSLY AND PROGRESSIVELY EXTRUDING A SECOND SHEET OF SAID MATERIAL IN MOLTEN FORM ONTO SAID SURFACE IMMEDIATELY FOLING SAID HEATING ZONE SO AS TO COVER SAID SURFACE WITH SAID SHEET; (3) SIMULTANEOUSLY AND PROGRESSIVELY COOLING AND PRESSING SAID SHEET ONTO SAID SURFACE IMMEDIATELY FOLOWING THE CONTACTING OF SAID SHEET WITH SAID SURFACE SO AS TO FUSE SAME TO SAID SURFACE; AND (4) APPLYING SUCCESSIVE SHEETS OF SAID MATERIAL TO THE EXPOSED SURFACE OF THE LAST APPLIED SHEET BY REPEATING STEPS (1), (2), AND (3) SO AS TO BUILD UP SAID SLAB.
Claim 4
Dependent Claim
91 words
SIMULTANEOUSLY AND PROGRESSIVELY EXTRUDING A SECOND SHEET OF SAID MATERIAL IN MOLTEN FORM ONTO SAID SURFACE IMMEDIATELY FOLING SAID HEATING ZONE SO AS TO COVER SAID SURFACE WITH SAID SHEET; (3) SIMULTANEOUSLY AND PROGRESSIVELY COOLING AND PRESSING SAID SHEET ONTO SAID SURFACE IMMEDIATELY FOLOWING THE CONTACTING OF SAID SHEET WITH SAID SURFACE SO AS TO FUSE SAME TO SAID SURFACE; AND (4) APPLYING SUCCESSIVE SHEETS OF SAID MATERIAL TO THE EXPOSED SURFACE OF THE LAST APPLIED SHEET BY REPEATING STEPS (1), (2), AND (3) SO AS TO BUILD UP SAID SLAB.
References Cited (Backward Citations)
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US2960425A
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US2932323A
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US2917874A
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US2956723A
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US2943349A
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US3045285A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |