Patent US2816883A successfully refreshed from Google Patents.
US2816883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product and process of polymerizing ethylene
Assignee: EIDP Inc
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Filing: 1951-08-02
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Granted: 1957-12-17
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Expires: 1971-08-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Larchar
- 👤 Donald C Pease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:13
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S260/00; Y10S260/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
SOLID POLYETHYLENE EXCEPTIONALLY STIFF, HAVING AN AMORPHOUS CONTENT OF NOT MORE THAN 10%, CONTAINING SIDE CHAINS, AT A FREQUENCY OF LESS THAN 1 SIDE CHAIN PER 200 CARBON ATOMS IN THE MAIN CHAIN AS DETERMINED BY INFRA-RED ABSORPTION ANALYSIS, HAVING A MELTING POINT ABOVE 127*C., A TENSILE STRENGTH BASED ON ORIGINAL DIMENSIONS, BETWEEN ABOUT 2900 AND ABOUT 11,800 POUNDS PER SQUARE INCH, A RELATIVE VISCOSITY ABOVE 1.0 AND UP TO ABOUT 1.5 MEASURED AT 0.125% CONCENTRATION IN XYLENE AT 85*C., AND A DENSITY (ANNEALED) IN THE RANGE OF 0.95 TO 0.97.
Claim 2
Dependent Claim
91 words
SOLID POLYETHYLENE EXCEPTIONALLY STIFF, HAVING AN AMORPHOUS CONTENT OF NOT MORE THAN 10%, CONTAINING SIDE CHAINS, AT A FREQUENCY OF LESS THAN 1 SIDE CHAIN PER 200 CARBON ATOMS IN THE MAIN CHAIN AS DETERMINED BY INFRA-RED ABSORPTION ANALYSIS, HAVING A MELTING POINT ABOVE 127*C., A TENSILE STRENGTH BASED ON ORIGINAL DIMENSIONS, BETWEEN ABOUT 2900 AND ABOUT 11,800 POUNDS PER SQUARE INCH, A RELATIVE VISCOSITY ABOVE 1.0 AND UP TO ABOUT 1.5 MEASURED AT 0.125% CONCENTRATION IN XYLENE AT 85*C., AND A DENSITY (ANNEALED) IN THE RANGE OF 0.95 TO 0.97.
Claim 3
Dependent Claim
57 words
IN A PROCESS FOR THE PREPARATION OF SOLID HOMOPOLYMERS OF ETHYLENE, THE STEP WHICH COMPRISES CONDUCT ING THE POLYMERIZATION AT A PRESSURE IN THE RANGE OF 5,000 TO 20,000 ATMOSPHERES AND A TEMPERATURES BETWEEN 45*C. AND 200*C. IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP OF AZO COMPOUNDS, PEROXIDES, AMINE OXIDES, HYDRAZINES AND HYDRAZINIUM COMPOUNDS
Claim 4
Dependent Claim
57 words
IN A PROCESS FOR THE PREPARATION OF SOLID HOMOPOLYMERS OF ETHYLENE, THE STEP WHICH COMPRISES CONDUCT ING THE POLYMERIZATION AT A PRESSURE IN THE RANGE OF 5,000 TO 20,000 ATMOSPHERES AND A TEMPERATURES BETWEEN 45*C. AND 200*C. IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP OF AZO COMPOUNDS, PEROXIDES, AMINE OXIDES, HYDRAZINES AND HYDRAZINIUM COMPOUNDS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |