Patent US3372154A successfully refreshed from Google Patents.
US3372154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymer powders and process therefor
Assignee: Union Carbide Corp
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Filing: 1965-04-09
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Granted: 1968-03-05
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Expires: 1985-04-09
Abstract
No abstract record available.
Inventors
- 👤 Turner Andrew
- 👤 Edgar W Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:51
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
IN A PROCESS FOR PRODUCING A POWDERED ETHYLENE POLYMER COMPRISING POLYMERIING ETHYLENE IN CONTACT WITH A FRE-RADICAL INITIATOR IN A REACTION ZONE AT ELEVATED PRESSURE FOLLOWED BY WITHDRAWING THE POLYMERIZATION PRODUCT FROM THE REACTION ZONE AND REDUCING THE PRESSURE OF SAID POLYMER PRODUCT TO ABOUT ATMOSPHERIC PRESSURE, THE IMPROVEMENT OF SUBSEQUENT TO SAID POLYMERIZATION AND PRIOR TO SAID PRESSURE REDUCTION ADMIXING SAID POLYMERIZATION PRODUCT WITH ETHYLENE HAVING A TEMPERATURE OF AT LEAST 100*C. BELOW THAT OF THE REACTION ZONE IN AN AMOUNT OF AT LEAST 10 WEIGHT PERCENT OF THE TOTAL WEIGHT OF MONOMER FED TO SAID REACTION ZONE.
References Cited (Backward Citations)
US2831845A
Cited
US3090778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |