Patent US2581360A successfully refreshed from Google Patents.
US2581360A
Expired / Lapsed
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⏱️ 0.0 years remaining
Method of stabilizing polymers comprising vinyl or vinylidene chlorides
Assignee: Dow Chemical Co
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Filing: 1950-03-11
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Granted: 1952-01-08
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Expires: 1970-03-11
Abstract
No abstract record available.
Inventors
- 👤 John E Costa
- 👤 Mcintire Otis Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:32
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD WHICH COMPRISES MIXING INTIMATELY IN AN EVAPORATIVE ATMOSPHERE A STREAM OF AN AQUEOUS LATEX-LIKE DISPERSION OF A POLYMER WHICH CONTAINS AT LEAST 10 PER CENT OF MEMBER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE POLYMERIZED THEREIN, WITH A STREAM OF AN AQUEOUS SOLUTION OF A NORMALLY SOLID, WATER-SOLUBLE INORGANIC STABILIZER FOR SUCH POLYMER, THE SAID STREAMS BEING SUPPLIED AT RATES TO PROVIDE FROM 5 TO 40 PARTS BY WEIGHT OF THE STABILIZER WHILE CORRESPONDINGLY FROM 95 TO 60 PARTS OF THE POLYMER ARE BEING SUPPLIED, FLASHING WATER VAPOR FROM THE SO-MIXED STREAMS, RECOVERING THE SPRAY-DRIED CONCENTRATED OF STABILIZER IN POLYMER, AND BLENDING THIS CONCENTRATE INTIMATELY WITH ADDITIONAL POWDERED POLYMER IN A PROPORTION TO PROVIDE FROM 0.1 TO 2 PER CENT OF THE STABILIZER IN THE FINAL MIXTURE.
Claim 2
Independent Claim
133 words
THE METHOD WHICH COMPRISES MIXING INTIMATELY IN AN EVAPORATIVE ATMOSPHERE A STREAM OF AN AQUEOUS LATEX-LIKE DISPERSION OF A POLYMER WHICH CONTAINS AT LEAST 10 PER CENT OF MEMBER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE POLYMERIZED THEREIN, WITH A STREAM OF AN AQUEOUS SOLUTION OF A NORMALLY SOLID, WATER-SOLUBLE INORGANIC STABILIZER FOR SUCH POLYMER, THE SAID STREAMS BEING SUPPLIED AT RATES TO PROVIDE FROM 5 TO 40 PARTS BY WEIGHT OF THE STABILIZER WHILE CORRESPONDINGLY FROM 95 TO 60 PARTS OF THE POLYMER ARE BEING SUPPLIED, FLASHING WATER VAPOR FROM THE SO-MIXED STREAMS, RECOVERING THE SPRAY-DRIED CONCENTRATED OF STABILIZER IN POLYMER, AND BLENDING THIS CONCENTRATE INTIMATELY WITH ADDITIONAL POWDERED POLYMER IN A PROPORTION TO PROVIDE FROM 0.1 TO 2 PER CENT OF THE STABILIZER IN THE FINAL MIXTURE.
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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |