Patent US4531577A successfully refreshed from Google Patents.
Patent US3726648A successfully refreshed from Google Patents.
US3726648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulk polymerizer for vinyl chloride production
Assignee: Buss AG
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Filing: 1971-01-25
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Granted: 1973-04-10
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Expires: 1991-01-25
Abstract
Abstract APPARATUS FOR BULK POLYMERIZATION COMPRISING FEEDING MEANS FOR CONTINUOUSLY FEEDING A MONOMER AND REACTION INITIATOR ADDITIVES IN A JACKETED REACTION VESSEL WITH MIXING AND SIMULTANEOUSLY CONVEYING MEANS THEREFORE FOR MOVING THE COMPONENTS IN A MAIN CONVEYING DIRECTION. THE APPARATUS INCLUDES MEANS WITHIN THE REACTION VESSEL FOR REPEATEDLY FEEDING A PREDETERMINED AND SELECTABLE PORTION OF THE REACTION MASS IN A DIRECTION OPPOSITE TO THE MAIN CONVEYING DIRECTION AND BACKWARDS INTO THE PRECEDING REACTION SPACES.
Inventors
- 👤 W Weber
- 👤 W Gresch
- 👤 I Stojanovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:01
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/20; C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |