US2928820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene process
Assignee: WR Grace and Co
•
Filing: 1957-10-30
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Granted: 1960-03-15
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Expires: 1977-10-30
Abstract
No abstract record available.
Inventors
- 👤 Alelio Gaetano F D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:52
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF POLYMERIZING ETHYLENE THAT INCLUDES THE STEPS OF HEATING AT A TEMPERATURE OF AT LEAST 130*C. A MIXTURE CONSISTING ESSENTIALLY OF TITANIUM TETRACHLORIDE AND IRON IN THE RATIO OF AT LEAST 1 MOLE TICL4 PER 1400 MOLES OF FE, STOPPING THE REACTION BEFORE ALL THE FE IS CONSUMED, TO FORM A PRODUUCT COMPRISING IRON AND A REACTION PRODUCT OF IRON AND TITANIUUM TETRACHLORIDE, REMOVING HYDROCARBON SOLUBLE CHLORIDES FROM THE SAID PRODUCT TO FORM A POLYETHYLENE CATALYST, AND THEREAFTER CONTACTING ETHYLENE IN AN INERT HYDROCARBON SOLVENT WITH THE SAID CATALYST.
Claim 2
Independent Claim
91 words
THE METHOD OF POLYMERIZING ETHYLENE THAT INCLUDES THE STEPS OF HEATING AT A TEMPERATURE OF AT LEAST 130*C. A MIXTURE CONSISTING ESSENTIALLY OF TITANIUM TETRACHLORIDE AND IRON IN THE RATIO OF AT LEAST 1 MOLE TICL4 PER 1400 MOLES OF FE, STOPPING THE REACTION BEFORE ALL THE FE IS CONSUMED, TO FORM A PRODUUCT COMPRISING IRON AND A REACTION PRODUCT OF IRON AND TITANIUUM TETRACHLORIDE, REMOVING HYDROCARBON SOLUBLE CHLORIDES FROM THE SAID PRODUCT TO FORM A POLYETHYLENE CATALYST, AND THEREAFTER CONTACTING ETHYLENE IN AN INERT HYDROCARBON SOLVENT WITH THE SAID CATALYST.
References Cited (Backward Citations)
DE874215C
Cited
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 |