US2933485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene process
Assignee: WR Grace and Co
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Filing: 1957-10-30
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Granted: 1960-04-19
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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
2026-10-29 06:08
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/906; Y10S585/00; Y10S585/929; Y10S585/945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE METHOD OF POLYMERIZING ETHYLENE THAT INCLUDES THE STEP OF CONTACTING ETHYLENE IN AN INERT HYDROCARBON SOLVENT WITH A CATALYST CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF TICL4 AND A METAL OF THE GROUP CONSISTING OF COBALT AND NICKEL PREPARED BY REACTING TICL4 WITH RESPECT TO SAID METAL IN THE RATIO OF AT LEAST 1 MOLE OF TICL4 PER 500 MOLES OF SAID METAL AND DISCONTINUING THE REACTION BEFORE ALL THE METAL IS CONSUMED, AND RECOVERING THE THUS-FORMED POLYETHYLENE.
Claim 2
Independent Claim
79 words
THE METHOD OF POLYMERIZING ETHYLENE THAT INCLUDES THE STEP OF CONTACTING ETHYLENE IN AN INERT HYDROCARBON SOLVENT WITH A CATALYST CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF TICL4 AND A METAL OF THE GROUP CONSISTING OF COBALT AND NICKEL PREPARED BY REACTING TICL4 WITH RESPECT TO SAID METAL IN THE RATIO OF AT LEAST 1 MOLE OF TICL4 PER 500 MOLES OF SAID METAL AND DISCONTINUING THE REACTION BEFORE ALL THE METAL IS CONSUMED, AND RECOVERING THE THUS-FORMED POLYETHYLENE.
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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |