US3658741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homogeneous copolymers from ethylene
Assignee: Honeywell International Inc
•
Filing: 1966-09-19
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Granted: 1972-04-25
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Expires: 1986-09-19
Abstract
Abstract HOMOGENEOUS COPOLYMERS OF ETHYLENE AND A COMONOMER SELECTED FROM THE GROUP CONSISTING OF UNSATURATED CARBOXYLIC ACIDS AND ESTERS AND SALTS THEREOF MAY BE PREPARED BY REACTING THE MONOMERS IN THE PRESENCE OF A CHAIN TRANSFER AGENT AND A FREE RADICAL CATALYST IN THE VAPOR PHASE AT A TEMPERATURE BETWEEN 100*C. AND 300*C. AND AT A PRESSURE BETWEEN 100 AND 1000 ATMOSPHERES, WITH TURBULENT AGITATION WITHIN AN ENCLOSED ENLARGED REACTION ZONE, AND WITH THE FEED, OFF-GAS DISCHARGE AND PRODUCT WITHDRAWAL SO CONTROLLED AS TO MAINTAIN THE RATIO OF WEIGHT PERCENT COMONOMER IN THE PRODUCT TO WEIGHT PERCENT COMONOMER IN THE FEED WITHIN THE RANGE OF 0.7:1 TO 1.8:1.
Inventors
- 👤 Harry Knutson
- 👤 John E Dench
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:12
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/62; C08F10/00; C08F22/00; Y; Y10; Y10S; Y10S526/00; Y10S526/913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |