US2976572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a molding material from high molecular weight substances and the resulting products
Assignee: Onderzoekings Instituut Research
•
Filing: 1957-05-17
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Granted: 1961-03-28
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Expires: 1977-05-17
Abstract
No abstract record available.
Inventors
- 👤 Kessler Jacob Christ Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:54
CPC Classifications
C; C08; C08J; C08J3/00; B; B29; B29B; B29B13/00; B29B9/00; B29C; B29C45/00; B29C45/0001; C08J3/12; C08J3/124; C08J2377/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD FOR THE PREPARATION OF SHAPED ARTICLES COMPRISING THE STEPS OF HEATING CRYSTALLIZABLE SYNTHETIC LINEAR POLYAMIDES OF RELATIVELY LOW MONOMER CONTENT FROM THE SOLID PHASE TO ABOVE THEIR MELTING POINT BUT BELOW THE POINT OF INCIPIENT THERMAL DEGRADATION THEREOF, SUBJECTING THE HEATED POLYMERIC MATERIAL TO INTENSIVE MECHANICAL WORKING INCLUDING RUBBING AND SHEARING FORCES SEUFFICIENTLY GREAT SUCH THAT UPON COOLING THE POLYMERIC MATERIAL ONLY A DISTURBED SPHERULITIC STRUCTURE IS FORMED, COOLING THE POLYMERIC MATERIAL, FINELY DIVIDING THE SAME, REMELTING THE POLYMERIC MATERIAL, SHAPING SAID REMELTED MATERIAL, AND COOLING SAID SHAPED MATERIAL WHEREBY A BODY IS OBTAINED HAVING A HOMOGENEOUS DISTURBED SPHERULITIC STRUCTURE.
Claim 2
Independent Claim
102 words
A METHOD FOR THE PREPARATION OF SHAPED ARTICLES COMPRISING THE STEPS OF HEATING CRYSTALLIZABLE SYNTHETIC LINEAR POLYAMIDES OF RELATIVELY LOW MONOMER CONTENT FROM THE SOLID PHASE TO ABOVE THEIR MELTING POINT BUT BELOW THE POINT OF INCIPIENT THERMAL DEGRADATION THEREOF, SUBJECTING THE HEATED POLYMERIC MATERIAL TO INTENSIVE MECHANICAL WORKING INCLUDING RUBBING AND SHEARING FORCES SEUFFICIENTLY GREAT SUCH THAT UPON COOLING THE POLYMERIC MATERIAL ONLY A DISTURBED SPHERULITIC STRUCTURE IS FORMED, COOLING THE POLYMERIC MATERIAL, FINELY DIVIDING THE SAME, REMELTING THE POLYMERIC MATERIAL, SHAPING SAID REMELTED MATERIAL, AND COOLING SAID SHAPED MATERIAL WHEREBY A BODY IS OBTAINED HAVING A HOMOGENEOUS DISTURBED SPHERULITIC STRUCTURE.
References Cited (Backward Citations)
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US2370721A
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US2436201A
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |