Patent US3140279A successfully refreshed from Google Patents.
US3140279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Post extrusion crosslinking of polyethylene
Assignee: WR Grace and Co
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Filing: 1961-08-03
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Granted: 1964-07-07
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Expires: 1981-08-03
Abstract
No abstract record available.
Inventors
- 👤 Razmic S Gregorian
- 👤 Richard A Bafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K5/0091; C08K5/14; Y; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE PROCESS OF CROSSLINKING POLYETHYLENE AT A TEMPERATURE NEAR ITS MELTING POINT WHICH COMPRISES ADMIXING POLYETHYLENE WITH A POLYETHYLENE SOLUBLE CROSSLINKING PROMOTER SELECTED FROM THE GROUP CONSISTING OF ORGANIC ACID SALTS OF MN AND CO AND COMPLEXES OF MN AND CO WITH ACETHYLACETONATES, DIMETHYL GLYOXIMES AND BENZOIN OXIMES, CONTACTING THE POLYETHYLENE COMPOSITION WITH A LIQUID ALKYL HYDROPEROXIDE AND THEREAFTER IN THE ABSENCE OF OXYGEN HEATING THE POLYETHYLENE COMPOSITION TO A TEMPERATURE WITHIN 30* BELOW ITS MELTING POINT UP TO 10*C. ABOVE ITS MELTING POINT.
Claim 2
Dependent Claim
84 words
THE PROCESS OF CROSSLINKING POLYETHYLENE AT A TEMPERATURE NEAR ITS MELTING POINT WHICH COMPRISES ADMIXING POLYETHYLENE WITH A POLYETHYLENE SOLUBLE CROSSLINKING PROMOTER SELECTED FROM THE GROUP CONSISTING OF ORGANIC ACID SALTS OF MN AND CO AND COMPLEXES OF MN AND CO WITH ACETHYLACETONATES, DIMETHYL GLYOXIMES AND BENZOIN OXIMES, CONTACTING THE POLYETHYLENE COMPOSITION WITH A LIQUID ALKYL HYDROPEROXIDE AND THEREAFTER IN THE ABSENCE OF OXYGEN HEATING THE POLYETHYLENE COMPOSITION TO A TEMPERATURE WITHIN 30* BELOW ITS MELTING POINT UP TO 10*C. ABOVE ITS MELTING POINT.
References Cited (Backward Citations)
US2628214A
Cited
GB784611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |