Patent US2904409A successfully refreshed from Google Patents.
US2904409A
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Polymerization apparatus
Assignee: 3M Co
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Filing: 1956-04-20
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Granted: 1959-09-15
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Expires: 1976-04-20
Abstract
No abstract record available.
Inventors
- 👤 Archibald N Bolstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:28
CPC Classifications
B; B01; B01J; B01J4/00; B01J4/001; B01J4/002; C; C08; C08F; C08F214/00; C08F214/18; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
APPARATUS FOR USE IN CONDUCTING POLYMERIZATION REACTIONS COMPRISING A VERTICALLY ELONGATED VESSEL PROVIDED WITH A FORAMINOUS PLATE MOUNTED ACROSS THE LOWER PORTION OF SAID VESSEL, SPRAY MEANS FOR INTRODUCINGS A CATALYST SOLUTION INTO THE UPPER PORTION OF THE VESSEL, MEANS FOR INTRODUCING MONOMERS INTO THE VESSEL BELOW SAID FORAMINOUS PLATE, EXTERNAL MEANS FOR RECIRCULATING MONOMERS IN THE VAPOR PHASE DIRECTLY FROM THE UPPER TO THE LOWER PORTION OF THE VESSEL, AND MEANS FOR REMOVING POLYMER PRODUCT FROM THE VESSEL.
Claim 2
Dependent Claim
79 words
APPARATUS FOR USE IN CONDUCTING POLYMERIZATION REACTIONS COMPRISING A VERTICALLY ELONGATED VESSEL PROVIDED WITH A FORAMINOUS PLATE MOUNTED ACROSS THE LOWER PORTION OF SAID VESSEL, SPRAY MEANS FOR INTRODUCINGS A CATALYST SOLUTION INTO THE UPPER PORTION OF THE VESSEL, MEANS FOR INTRODUCING MONOMERS INTO THE VESSEL BELOW SAID FORAMINOUS PLATE, EXTERNAL MEANS FOR RECIRCULATING MONOMERS IN THE VAPOR PHASE DIRECTLY FROM THE UPPER TO THE LOWER PORTION OF THE VESSEL, AND MEANS FOR REMOVING POLYMER PRODUCT FROM THE VESSEL.
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |