US2819231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing polyethylene foams
Assignee: EIDP Inc
•
Filing: 1953-10-13
•
Granted: 1958-01-07
•
Expires: 1973-10-13
Abstract
No abstract record available.
Inventors
- 👤 Oliver M Hahn
- 👤 Jr Harold B Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/107; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A PROCESS FOR THE PREPARATION OF SOLID POLYETHYLENE FOAM THE STEPS WHICH COMPRISE INITIALLY ADMIXING POLYETHYOENE WITH DI-N-NITROSOPENTAMETHYLENETETRAMINE IN SUFFICIENT QUANTITY TO PREVENT SHOCK SENSITIVITY, SAID QUANTITY OF POLYETHYLENE BEING AT LEAST 0.5 TIMES THE QUANTITY OF DI-N-NITROSOPENTAMETHYLENETETRAMINE, ADMIXING POLYETHYLENE WITH THE RESULTANT MIXTURE IN SUFFICIENT QUANTITY TO LOWER THE CONTENT OF DI-N-NITROSOPENTAMETHYLENETETRAMINE IN THE RESULTING MIXTURE TO 0.5-5.0%, BASED ON THE TOTAL WEIGHT OF POLYETHYLENE PRESENT, AND EXTRUDING THE RESULTING MIXTURE IN THE FORM OF SOILD POLYETHYLEN FOAM AT A TEMPEARATURE SUFFICIENTLY HIGH TO PRODUCE THERMAL DECOMPOSITION OF THE DI-N-NITROSOPENTAMETHYLENETETRAMINE.
Claim 2
Dependent Claim
92 words
IN A PROCESS FOR THE PREPARATION OF SOLID POLYETHYLENE FOAM THE STEPS WHICH COMPRISE INITIALLY ADMIXING POLYETHYOENE WITH DI-N-NITROSOPENTAMETHYLENETETRAMINE IN SUFFICIENT QUANTITY TO PREVENT SHOCK SENSITIVITY, SAID QUANTITY OF POLYETHYLENE BEING AT LEAST 0.5 TIMES THE QUANTITY OF DI-N-NITROSOPENTAMETHYLENETETRAMINE, ADMIXING POLYETHYLENE WITH THE RESULTANT MIXTURE IN SUFFICIENT QUANTITY TO LOWER THE CONTENT OF DI-N-NITROSOPENTAMETHYLENETETRAMINE IN THE RESULTING MIXTURE TO 0.5-5.0%, BASED ON THE TOTAL WEIGHT OF POLYETHYLENE PRESENT, AND EXTRUDING THE RESULTING MIXTURE IN THE FORM OF SOILD POLYETHYLEN FOAM AT A TEMPEARATURE SUFFICIENTLY HIGH TO PRODUCE THERMAL DECOMPOSITION OF THE DI-N-NITROSOPENTAMETHYLENETETRAMINE.
References Cited (Backward Citations)
US2200473A
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US2349048A
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US2518454A
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US2570182A
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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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |