US3213071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed olefin polymer process
Assignee: Phillips Petroleum Co
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Filing: 1959-11-16
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Granted: 1965-10-19
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Expires: 1979-11-16
Abstract
No abstract record available.
Inventors
- 👤 Paul E Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:59
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S521/00; Y10S521/918; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249988; Y10T428/249991; Y10T428/249992; Y10T428/249993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A METHOD FOR CONVERTING A POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF ALIPHATIC MONO1-OLEFINS HAVING FROM 2 TO 8 CARBON ATOMS PER MOLECULE AND COPOLYMERS OF MIXTURES OF ALIPHATIC MONO-1-OLEFINS HAVING FROM 2 TO 8 CARBON ATOMS PER MOLECULE INTO A MATERIAL HAVING A FINELY DIVIDED FORM WHICH COMPRISES SUBJECTING A MIXTURE OF SAID POLYMER WITH A CHEMICAL BLOWING AGENT TO A TEMPERATURE IN THE RANGE OF ABOUT 250*F. TO ABOUT 500*F. AT A PRESSURE IN THE RANGE OF ATMOSPHERIC TO 800 P.S.I.G., THE AMOUNT OF SAID CHEMICAL BLOWING AGENT BEING THE RANGE OF ABOUT 1 TO ABOUT 40 PARTS BY WEIGHT PER 100 PARTS OF SAID POLYMERS TO PRODUCE GAS FROM SAID CHEMICAL BLOWING AGENT AND THEREBY CAUSE FOAMING OF SAID POLYMER; CHOPPING THE RESULTING POLYMER INTO PIECES VARYING IN SIZE FROM ABOUT 1/8 TO 3/8 INCH; GRINDING SAID PIECES IN A GRINDING ZONE TO PRODUCE FINELY DIVIDED POLYMER HAVING A PARTICLE SIZE IN THE RANGE OF ABOUT 30 TO ABOUT 325 MESH; AND WITHDRAWING SAID FINELY DIVIDED POLYMER FROM SAID GRINDING ZONE.
Claim 2
Independent Claim
176 words
A METHOD FOR CONVERTING A POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF ALIPHATIC MONO1-OLEFINS HAVING FROM 2 TO 8 CARBON ATOMS PER MOLECULE AND COPOLYMERS OF MIXTURES OF ALIPHATIC MONO-1-OLEFINS HAVING FROM 2 TO 8 CARBON ATOMS PER MOLECULE INTO A MATERIAL HAVING A FINELY DIVIDED FORM WHICH COMPRISES SUBJECTING A MIXTURE OF SAID POLYMER WITH A CHEMICAL BLOWING AGENT TO A TEMPERATURE IN THE RANGE OF ABOUT 250*F. TO ABOUT 500*F. AT A PRESSURE IN THE RANGE OF ATMOSPHERIC TO 800 P.S.I.G., THE AMOUNT OF SAID CHEMICAL BLOWING AGENT BEING THE RANGE OF ABOUT 1 TO ABOUT 40 PARTS BY WEIGHT PER 100 PARTS OF SAID POLYMERS TO PRODUCE GAS FROM SAID CHEMICAL BLOWING AGENT AND THEREBY CAUSE FOAMING OF SAID POLYMER; CHOPPING THE RESULTING POLYMER INTO PIECES VARYING IN SIZE FROM ABOUT 1/8 TO 3/8 INCH; GRINDING SAID PIECES IN A GRINDING ZONE TO PRODUCE FINELY DIVIDED POLYMER HAVING A PARTICLE SIZE IN THE RANGE OF ABOUT 30 TO ABOUT 325 MESH; AND WITHDRAWING SAID FINELY DIVIDED POLYMER FROM SAID GRINDING ZONE.
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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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |