US3217787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cooling a gaseous suspension of titanium dioxide
Assignee: Wyeth Holdings LLC
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Filing: 1961-08-18
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Granted: 1965-11-16
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Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
- 👤 Peter J Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:35
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01G23/075; C09; C09C; C09C3/00; C09C3/04; C01P; C01P2004/00; C01P2004/60; C01P2004/80; C01P2006/00; C01P2006/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A PROCESS WHICH COMPRISES PASSING A GASEOUS SUSPENSION OF TITANIUM DIOXIDE PIGMENT AT A TEMPERATURE ABOVE THE TACK POINT OF THE PIGMENT UPWARDLY THROUGH AN ELONGATED ZONE, PASSING A MASS OF INERT PARTICLES IN THE SIZE RANGE OF ABOUT 10 TO 100 MESH DOWNWARDLY IN SAID ELONGATED ZONE IN COUNTERCURRENT CONTACT WITH SAID UPFLOWING GASEOUS SUSPENSION IN ORDER TO COOL THE TITANIUM DIOXIDE PIGMENT, WITHDRAWING COOLED GASEOUS SUSPENSION OF TITANIUM DIOXIDE PIGMENT FROM THE UPPER PART OF ELONGATED ZONE, WITHDRAWING HOT INERT PARTICLES CONTAINING ADHERING TITANIUM DIOXIDE PIGMENT FROM THE LOWER PART OF THE ELONGATED ZONE, PASSING THE HOT INERT PARTICLES CONTAINING TITANIUM DIOXIDE PIGMENT TO A COOLING ZONE WHEREIN THE TEMPERATURE THEREOF IS REDUCED TO BELOW THE TACK POINT OF THE TITANIUM DIOXIDE PIGMENT, PASSING THE COOLED INERT PARTICLES CONTAINING TITANIUM DIOXIDE PIGMENTS TO AN ELUTRIATIOR ZONE WHEREIN THE TITANIUM DIOXIDE PIGMENT IS ELUTRIATED FROM THE INERT PARTICLES BY MEANS OF A GASIFORM MATERIAL,
Claim 2
Dependent Claim
155 words
A PROCESS WHICH COMPRISES PASSING A GASEOUS SUSPENSION OF TITANIUM DIOXIDE PIGMENT AT A TEMPERATURE ABOVE THE TACK POINT OF THE PIGMENT UPWARDLY THROUGH AN ELONGATED ZONE, PASSING A MASS OF INERT PARTICLES IN THE SIZE RANGE OF ABOUT 10 TO 100 MESH DOWNWARDLY IN SAID ELONGATED ZONE IN COUNTERCURRENT CONTACT WITH SAID UPFLOWING GASEOUS SUSPENSION IN ORDER TO COOL THE TITANIUM DIOXIDE PIGMENT, WITHDRAWING COOLED GASEOUS SUSPENSION OF TITANIUM DIOXIDE PIGMENT FROM THE UPPER PART OF ELONGATED ZONE, WITHDRAWING HOT INERT PARTICLES CONTAINING ADHERING TITANIUM DIOXIDE PIGMENT FROM THE LOWER PART OF THE ELONGATED ZONE, PASSING THE HOT INERT PARTICLES CONTAINING TITANIUM DIOXIDE PIGMENT TO A COOLING ZONE WHEREIN THE TEMPERATURE THEREOF IS REDUCED TO BELOW THE TACK POINT OF THE TITANIUM DIOXIDE PIGMENT, PASSING THE COOLED INERT PARTICLES CONTAINING TITANIUM DIOXIDE PIGMENTS TO AN ELUTRIATIOR ZONE WHEREIN THE TITANIUM DIOXIDE PIGMENT IS ELUTRIATED FROM THE INERT PARTICLES BY MEANS OF A GASIFORM MATERIAL,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |