US2945828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite materials for producing cellular polyethylene articles
Assignee: AT&T Inc
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Filing: 1957-02-20
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Granted: 1960-07-19
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Expires: 1977-02-20
Abstract
No abstract record available.
Inventors
- 👤 George E Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A DRY COMPOSITE MATERIAL SUITABLE FOR USE IN THE PRODUCTION OF EXTRUDED CELLULAR POLYETHYLENE, WHICH COMPRISES A PLURALITH OF RELATIVELY ALRGE GRANULES OF POLYETHYLENE, A FILM OF POLYSTYRENE COATING SUBSTANTIALLY UNIFORMLY THE SURFACES OF EACH GRANULE OF POLYETHYLENE, AND A MINOR AMOUNT OF A BLOWING AGENT FOR POLYETHYLENE IN THE FORM OF EXTREMELY FINELY-DIVIDED PARTICLES THEREOF ADHERED TO THE GRANULES OF POLYETHYLENE BY THE POLYSTYRENE FILMS, THE BLOWING AGENT BEING OF A TYPE WHICH IS THERMALLY DECOMPOSABLE DURING THE EXTRUSION OF POLYETHYLENE INTO GASEOUS PRODUCTS LEAVING NO POLAR RESIDUE, SAID MINOR AMOUNT OF THE BLOWING AGENT BEING AT LEAST SUFFICIENT TO PRODUCE THE DESIRED EXPANSION AND LESS THAN ABOUT 15 PARTS BY WEIGHT OF THE BLOWING AGENT TO 100 PARTS BY WEIGHT OF THE POLYETHYLENE.
Claim 2
Dependent Claim
125 words
A DRY COMPOSITE MATERIAL SUITABLE FOR USE IN THE PRODUCTION OF EXTRUDED CELLULAR POLYETHYLENE, WHICH COMPRISES A PLURALITH OF RELATIVELY ALRGE GRANULES OF POLYETHYLENE, A FILM OF POLYSTYRENE COATING SUBSTANTIALLY UNIFORMLY THE SURFACES OF EACH GRANULE OF POLYETHYLENE, AND A MINOR AMOUNT OF A BLOWING AGENT FOR POLYETHYLENE IN THE FORM OF EXTREMELY FINELY-DIVIDED PARTICLES THEREOF ADHERED TO THE GRANULES OF POLYETHYLENE BY THE POLYSTYRENE FILMS, THE BLOWING AGENT BEING OF A TYPE WHICH IS THERMALLY DECOMPOSABLE DURING THE EXTRUSION OF POLYETHYLENE INTO GASEOUS PRODUCTS LEAVING NO POLAR RESIDUE, SAID MINOR AMOUNT OF THE BLOWING AGENT BEING AT LEAST SUFFICIENT TO PRODUCE THE DESIRED EXPANSION AND LESS THAN ABOUT 15 PARTS BY WEIGHT OF THE BLOWING AGENT TO 100 PARTS BY WEIGHT OF THE POLYETHYLENE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |