Patent US2958669A successfully refreshed from Google Patents.
US2958669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry, free-flowing, pigmented polyvinyl chloride composition and method of making
Assignee: AT&T Inc
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Filing: 1957-01-30
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Granted: 1960-11-01
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Expires: 1977-01-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest D Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:53
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J3/203; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2427/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
THE METHOD OF MAKING DRY, FREE-FLOWING, PIGMENTED POLYVINYL CHLORIDE GRANULAR COMPOSITIONS, WHICH COMPRISES FORMING A STIFF MASTIC MIX CONDUCIVE TO INTERNAL SHEARING AND WORKING CONTAINING POLYVINYL CHLORIDE GRANULES HAVING IRREGULAR SURFACES, DRY POWDERED PIGMENT AND A LIQUID SOLVATING PLASTICIZER FOR THE POLYVINYL CHLORIDE GRANULES, WHICH PLASTICIZER FOR THE POLYVINYL CHLORIDE ABSORBED PARTIALLY THEREBY, CAUSING HIGH SHEAR MIXING OF THE MASTIC MIX BY VIGOROUS KNEADING AND WORKING THEREOF UNTIL A DESIRED DEGREE OF DISPERSION AND SMEARING OF THE PIGMENT PARTICLES ON THE POLYVINYL CHLORIDE GRANULES IS OBTAINED, AND HEATING THE MASTIC MIX TO A TEMPERATURE BELOW THE MELTING POINT OF THE COMPOSITION WHILE MIXING OF THE MASTIC MIX UNTIL THE PLASTICIZER IS ABSORBED BY BOTH THE POLYVINYL CHLORIDE GRANULES AND THE PIGMENT, SO THAT PARTICLES OF THE PIGMENT ARE DISPERSED UPON AND ARE CAUSED TO ADHERE FIRMLY TO THE IRREGULAR SURFACES OF THE POLYVINYL CHLORIDE GRANULES AND THE GRANULES BECOME DRY AND FREE FLOWING, THE QUANTITY OF PLASTICIZER BEING FROM APPROXIMATELY 69 PERCENT TO APPROXIMATELY 150 PERCENT BY WEIGHT OF THE POLYVINLY CHLORIDE GRANULES AND BEING SUFFICIENT TO FORM THE STIFF MASTIC MIX BUT LESS THAN THAT WHICH COULD BE ABSORBED BY THE POLYVINYL CHLORIDE GRANULES PLUS THE PIGMENT, AND THE QUANTITY OF THE PIGMENT GEING FROM APPROXIMATELY 41 PERCENT TO APPROXIMATELY 273 PERCENT BY WEIGHT OF THE POLYVINYL CHLORIDE GRANULES.
Claim 2
Independent Claim
220 words
THE METHOD OF MAKING DRY, FREE-FLOWING, PIGMENTED POLYVINYL CHLORIDE GRANULAR COMPOSITIONS, WHICH COMPRISES FORMING A STIFF MASTIC MIX CONDUCIVE TO INTERNAL SHEARING AND WORKING CONTAINING POLYVINYL CHLORIDE GRANULES HAVING IRREGULAR SURFACES, DRY POWDERED PIGMENT AND A LIQUID SOLVATING PLASTICIZER FOR THE POLYVINYL CHLORIDE GRANULES, WHICH PLASTICIZER FOR THE POLYVINYL CHLORIDE ABSORBED PARTIALLY THEREBY, CAUSING HIGH SHEAR MIXING OF THE MASTIC MIX BY VIGOROUS KNEADING AND WORKING THEREOF UNTIL A DESIRED DEGREE OF DISPERSION AND SMEARING OF THE PIGMENT PARTICLES ON THE POLYVINYL CHLORIDE GRANULES IS OBTAINED, AND HEATING THE MASTIC MIX TO A TEMPERATURE BELOW THE MELTING POINT OF THE COMPOSITION WHILE MIXING OF THE MASTIC MIX UNTIL THE PLASTICIZER IS ABSORBED BY BOTH THE POLYVINYL CHLORIDE GRANULES AND THE PIGMENT, SO THAT PARTICLES OF THE PIGMENT ARE DISPERSED UPON AND ARE CAUSED TO ADHERE FIRMLY TO THE IRREGULAR SURFACES OF THE POLYVINYL CHLORIDE GRANULES AND THE GRANULES BECOME DRY AND FREE FLOWING, THE QUANTITY OF PLASTICIZER BEING FROM APPROXIMATELY 69 PERCENT TO APPROXIMATELY 150 PERCENT BY WEIGHT OF THE POLYVINLY CHLORIDE GRANULES AND BEING SUFFICIENT TO FORM THE STIFF MASTIC MIX BUT LESS THAN THAT WHICH COULD BE ABSORBED BY THE POLYVINYL CHLORIDE GRANULES PLUS THE PIGMENT, AND THE QUANTITY OF THE PIGMENT GEING FROM APPROXIMATELY 41 PERCENT TO APPROXIMATELY 273 PERCENT BY WEIGHT OF THE POLYVINYL CHLORIDE GRANULES.
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) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |