Patent US3551943A successfully refreshed from Google Patents.
US3551943A
Expired / Lapsed
US
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Controlled degradation
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1966-12-19
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Granted: 1971-01-05
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Expires: 1986-12-19
Abstract
Abstract A SYSTEM FOR THE CONTROLLED SCISSION OF POLYPROPYLENE COMPRISES AN EXTRUDER-REACTOR, MEANS FOR MEASURING A PARAMETER OF MOLECULAR WEIGHT OF POLYPROPYLENE AFTER PASSING THROUGH THE EXTRUDER-REACTOR, AND FEEDBACK MEANS FOR CHANGING THE CONDITIONS IN THE EXTRUDER-REACTOR IN RESPONSE TO THE PARAMETER OF MOLECULAR WEIGHT MEASURED. THIS SYSTEM MAY CONTAIN A PELLETIZER AND A CONTINUOUS RHEOMETER WHICH MEASURES THE PARAMETER OF MOLECULAR WEIGHT OF THE PELLETIZED POLYPROPYLENE.
Inventors
- 👤 John C Staton
- 👤 James P Keller
- 👤 Ronald C Kowalski
- 👤 John W Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:26
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/58; B29B7/72; B29B7/726; B29B7/74; B29B7/7404; B29B7/7409; B29B7/7414; B29B7/7461; B29B7/7476; B29B7/7485; B29B7/80; B29B7/82; B29B7/826; B29B9/00; B29B9/02; B29B9/06; B29C; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/922; B29C2948/92209; B29C2948/92504; B29C2948/92695; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92895; B29C2948/92923; B29C48/03; B29C48/05; B29C48/06; B29C48/07; B29C48/08; B29C48/12; C08F2810/00; C08F2810/10
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |