US3134830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of shaped parts of plasticized polyethylene
Assignee: Ruhrchemie AG
•
Filing: 1957-11-04
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Granted: 1964-05-26
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Expires: 1977-11-04
Abstract
No abstract record available.
Inventors
- 👤 Roelen Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/14; B29B; B29B11/00; B29B11/06; B29B11/12; B29C43/006; B32; B32B; B32B27/00; B29C2791/00; B29C2791/001; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/25; B29K2105/251; B29K2105/253; B29K2105/255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE PRODUCTION OF SHAPED, FILLED-OUT SOLID BLOCKS OF PLASTICIZED HIGH-DENSITY POLYETHYLENE IN A PLURALITY OF COMPRESSION STAGES WHEREIN IN A FIRST COMPRESSION STAGE SHAPE-RETAINING BLANKS ARE PRODUCED FROM FINELY DIVIDIED HIGH-DENSITY POLYETHYLENE WHICH SUBSEQUENTLY ARE PLASTICIZED IN A SECOND COMPRESSION STAGE UNDER APPLICATION OF HEAT, WHICH COMPRISES COMPRESSING SAID FINELY DIVIDED HIGH-DENSITY POLYETHYLENE SUBSTANTIALLY AT ROOM-TEMPERATURE AT PRESSURES RANGING FROM 100 TO 180 KG./CM.2 TO FORM SAID BLANKS, PLACING AT LEAST TWO OF SAID BLANKS IN A FACE-TO-FACE POSITION, AND COMPRESSING THE SAME INTO AN INTEGRAL AND SEAMLESS UNIT BY SUBJECTING THEM TO TEMPERATUES OF 150-180*C. AND TO PRESSURES OF 10 TO 25 KG./CM.2.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE PRODUCTION OF SHAPED, FILLED-OUT SOLID BLOCKS OF PLASTICIZED HIGH-DENSITY POLYETHYLENE IN A PLURALITY OF COMPRESSION STAGES WHEREIN IN A FIRST COMPRESSION STAGE SHAPE-RETAINING BLANKS ARE PRODUCED FROM FINELY DIVIDIED HIGH-DENSITY POLYETHYLENE WHICH SUBSEQUENTLY ARE PLASTICIZED IN A SECOND COMPRESSION STAGE UNDER APPLICATION OF HEAT, WHICH COMPRISES COMPRESSING SAID FINELY DIVIDED HIGH-DENSITY POLYETHYLENE SUBSTANTIALLY AT ROOM-TEMPERATURE AT PRESSURES RANGING FROM 100 TO 180 KG./CM.2 TO FORM SAID BLANKS, PLACING AT LEAST TWO OF SAID BLANKS IN A FACE-TO-FACE POSITION, AND COMPRESSING THE SAME INTO AN INTEGRAL AND SEAMLESS UNIT BY SUBJECTING THEM TO TEMPERATUES OF 150-180*C. AND TO PRESSURES OF 10 TO 25 KG./CM.2.
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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) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |