US2860377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for extruding and foaming resin
Assignee: EIDP Inc
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Filing: 1955-08-31
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Granted: 1958-11-18
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Expires: 1975-08-31
Abstract
No abstract record available.
Inventors
- 👤 Bernhardt Ernest Carl
- 👤 Jr Harold Barnard Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; B29C48/00; B29C48/03; B29C48/06; B29C48/07; B29C48/08; B29C48/09; B29C48/25; B29C48/285; B29C48/29; C08J9/122; B29K; B29K2105/00; B29K2105/0005; C08J2201/00; C08J2201/02; C08J2201/03; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE METHOD OF PRODUCING A PLASTIC FOAM WHICH COMPRISES DISSOLVING A GAS IN A PLASTIC MATERIAL WHILE THE SAID MATERIAL IS BEING ADVANCED THROUGH AN EXTRUDER BARREL BY THE ACTION OF A ROTATING EXTRUDER SCREW, AND EXTRUDING THE PLASTIC THROUGH A DIE, WHEREBY THE EXTRUDED PLASTIC FOAMS DUE TO RELEASE OF SAID GAS THEREFROM, SAID SCREW HAVING A ZONE OF GREATER DRAG FLOW CAPACITY FOLLOWING A THROTTLING ZONE OF LESSER DRAG-FLOW CAPACITY, SAID SCREW HAVING A HOLLOW CORE COMMUNICATING WITH SAID ZONE OF GREATER DRAG-FLOW CAPACITY, SAID COMMUNICATION BEING POSITIONED IN THE FORWARD HALF OF A CHANNEL BETWEEN THREADS IN THE ZONE OF GREATER DRAG FLOW CAPACITY, SAID GAS BEING INTRODUCED INTO SAID PLASTIC MATERIAL THROUGH SAID COMMUNICATION.
Claim 2
Independent Claim
118 words
THE METHOD OF PRODUCING A PLASTIC FOAM WHICH COMPRISES DISSOLVING A GAS IN A PLASTIC MATERIAL WHILE THE SAID MATERIAL IS BEING ADVANCED THROUGH AN EXTRUDER BARREL BY THE ACTION OF A ROTATING EXTRUDER SCREW, AND EXTRUDING THE PLASTIC THROUGH A DIE, WHEREBY THE EXTRUDED PLASTIC FOAMS DUE TO RELEASE OF SAID GAS THEREFROM, SAID SCREW HAVING A ZONE OF GREATER DRAG FLOW CAPACITY FOLLOWING A THROTTLING ZONE OF LESSER DRAG-FLOW CAPACITY, SAID SCREW HAVING A HOLLOW CORE COMMUNICATING WITH SAID ZONE OF GREATER DRAG-FLOW CAPACITY, SAID COMMUNICATION BEING POSITIONED IN THE FORWARD HALF OF A CHANNEL BETWEEN THREADS IN THE ZONE OF GREATER DRAG FLOW CAPACITY, SAID GAS BEING INTRODUCED INTO SAID PLASTIC MATERIAL THROUGH SAID COMMUNICATION.
References Cited (Backward Citations)
US2515250A
Cited
FR1081583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |