Patent US3300460A successfully refreshed from Google Patents.
US3300460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for mixing polyvinyl acetate with saponification catalyst
Assignee: Cumberland Chemical Corp
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Filing: 1962-10-24
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Granted: 1967-01-24
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Expires: 1982-10-24
Abstract
No abstract record available.
Inventors
- 👤 Alphonse J Vacca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:08
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR MIXING POLYVINYL ACETATE WITH AN ALKALINE SAPONIFICATION CATALYST UNDER A HIGH RATE OF SHEARING STRESS WHICH COMPRISES CONTINUOUSLY INTRODUCING A STREAM OF POLYVINYL ACETATE IN A LOWER ALKANOL SOLVENT IN A CONCENTRATION OF 5-30% BY WEIGHT INTO A MIXING ZONE, DIRECTING SAID STREAM AGAINST A ROTATING SURFACE HAVING A PLURALITY OF PROJECTIONS THEREON IN SAID MIXING ZONE, PASSING SAID STREAM RADIALLY OUTWARDLY BETWEEN SAID ROTATING SURFACE AND A STATIONARY SURFACE HAVING A PLURALITY OF PROJECTIONS THEREON AND THENCE RADIALLY INWARDLY BETWEEN A SECOND ROTATING SURFACE AND A SECOND STATIONARY SURFACE, BOTH HAVING PROJECTIONS THEREON, INTRODUCING A SOLUTION OF SAID SAPONIFICATION CATALYST INTO SAID MIXING ZONE, AGITATING THE RESULTANT MIXTURE OF POLYVINYL ACETATE AND
Claim 2
Dependent Claim
116 words
A PROCESS FOR MIXING POLYVINYL ACETATE WITH AN ALKALINE SAPONIFICATION CATALYST UNDER A HIGH RATE OF SHEARING STRESS WHICH COMPRISES CONTINUOUSLY INTRODUCING A STREAM OF POLYVINYL ACETATE IN A LOWER ALKANOL SOLVENT IN A CONCENTRATION OF 5-30% BY WEIGHT INTO A MIXING ZONE, DIRECTING SAID STREAM AGAINST A ROTATING SURFACE HAVING A PLURALITY OF PROJECTIONS THEREON IN SAID MIXING ZONE, PASSING SAID STREAM RADIALLY OUTWARDLY BETWEEN SAID ROTATING SURFACE AND A STATIONARY SURFACE HAVING A PLURALITY OF PROJECTIONS THEREON AND THENCE RADIALLY INWARDLY BETWEEN A SECOND ROTATING SURFACE AND A SECOND STATIONARY SURFACE, BOTH HAVING PROJECTIONS THEREON, INTRODUCING A SOLUTION OF SAID SAPONIFICATION CATALYST INTO SAID MIXING ZONE, AGITATING THE RESULTANT MIXTURE OF POLYVINYL ACETATE AND
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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |