US2835927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing cellular plastics
Assignee: AT&T Inc
•
Filing: 1953-05-07
•
Granted: 1958-05-27
•
Expires: 1973-05-07
Abstract
No abstract record available.
Inventors
- 👤 George E Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/32; B29C44/322; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF EXTRUDING A COVERING OF EXPANDED PLASTIC INO A CONTINUOUSLY ADVANCING FILAMENTARY CORE, WHICH COMPRISES THE STEPS OF FORCING A MIXTURE OF PLASTIC COMPOUND AND AN EXPANDING AGENT AROUND THE ADVANCING CORE AND THEOUGH AN ORIFICE HAVING A LONGITUDINAL CROSSSECTION OF A CONIC SECTION AND BEING SO HIGHLY RESTRICTED CIRCMUFERENTIALLY AT A PORTION THEREIN AS TO CAUSE THE RATIO OF THE LINEAR SPEED OF THE EXTRUDED COMPOUND AS IT IS EXTRUDED TO THE LINEAR SPEED OF THE ADVANCING CORE TO BE APPROXIMATELY 1.67 OR GRREATER, AND ABRUPTLY SUBJECTING THE COVERED CORE TO A PRESSURE DROP AFTER PASSING THROUGH THE MOST HIGHLY RESTRICTED PORTION OF THE ORIFICE TO CAUSE THE AGENT TO EXPAND THE MIXTURE INTO A CELLULAR FORM HAVING A HIGH PERCENTAGE OF ACCLUDED GAS THEREIN.
Claim 2
Independent Claim
128 words
THE METHOD OF EXTRUDING A COVERING OF EXPANDED PLASTIC INO A CONTINUOUSLY ADVANCING FILAMENTARY CORE, WHICH COMPRISES THE STEPS OF FORCING A MIXTURE OF PLASTIC COMPOUND AND AN EXPANDING AGENT AROUND THE ADVANCING CORE AND THEOUGH AN ORIFICE HAVING A LONGITUDINAL CROSSSECTION OF A CONIC SECTION AND BEING SO HIGHLY RESTRICTED CIRCMUFERENTIALLY AT A PORTION THEREIN AS TO CAUSE THE RATIO OF THE LINEAR SPEED OF THE EXTRUDED COMPOUND AS IT IS EXTRUDED TO THE LINEAR SPEED OF THE ADVANCING CORE TO BE APPROXIMATELY 1.67 OR GRREATER, AND ABRUPTLY SUBJECTING THE COVERED CORE TO A PRESSURE DROP AFTER PASSING THROUGH THE MOST HIGHLY RESTRICTED PORTION OF THE ORIFICE TO CAUSE THE AGENT TO EXPAND THE MIXTURE INTO A CELLULAR FORM HAVING A HIGH PERCENTAGE OF ACCLUDED GAS THEREIN.
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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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |