Patent US2928819A successfully refreshed from Google Patents.
US2928819A
Expired / Lapsed
US
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Process for the chlorination of polyethylene
Assignee: Ruhrchemie AG
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Filing: 1957-07-30
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Granted: 1960-03-15
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Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 Noeske Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:56
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR THE CHLORINATION OF SOLID POWDERED POLYETHYLENE AT TEMPERATURES BETWEEN 50 AND APPROXIMATELY 110*C. BY ACTION OF GASEOUS CHLORINE WHICH COMPRISES ADDING TO SAID POLYETHYLENE, PRIOR TO CHLORINATION, PULVERULENT SUBSTANCES, HAVING A PARTICLE SIZE OF LESS THAN 300 MICRONS, IN PROPORTIONS OF POLYETHYLENE TO SAID SUBSTANCES OF APPROXIMATELY 1:1 TO APPROXIMATELY 1:4, SAID PUULVERUULENT SUBSTANCES BEING INERT TO CHLORINE AND SELECTED FROM THE GROUP CONSISTING OF MAGNESIA, ANHYDROUS MAGNESIUM SULFATE, ANHYDROUS ALUMINUM SULFATE, ANHYDROUS SODIUM SULFATE AND SODIUM CHLORIDE, AND REMOVING SAID SUBSTANCES AFTER CHLORINATION.
Claim 2
Dependent Claim
87 words
A PROCESS FOR THE CHLORINATION OF SOLID POWDERED POLYETHYLENE AT TEMPERATURES BETWEEN 50 AND APPROXIMATELY 110*C. BY ACTION OF GASEOUS CHLORINE WHICH COMPRISES ADDING TO SAID POLYETHYLENE, PRIOR TO CHLORINATION, PULVERULENT SUBSTANCES, HAVING A PARTICLE SIZE OF LESS THAN 300 MICRONS, IN PROPORTIONS OF POLYETHYLENE TO SAID SUBSTANCES OF APPROXIMATELY 1:1 TO APPROXIMATELY 1:4, SAID PUULVERUULENT SUBSTANCES BEING INERT TO CHLORINE AND SELECTED FROM THE GROUP CONSISTING OF MAGNESIA, ANHYDROUS MAGNESIUM SULFATE, ANHYDROUS ALUMINUM SULFATE, ANHYDROUS SODIUM SULFATE AND SODIUM CHLORIDE, AND REMOVING SAID SUBSTANCES AFTER CHLORINATION.
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) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |