US5024827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine particulate material
Assignee: Tioxide Group Ltd
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Filing: 1989-05-30
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Granted: 1991-06-18
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Expires: 2009-05-30
Abstract
Abstract A new form of titanium dioxide has been developed in which the particles have a substantially rectangular cross-section with a width to length ratio of at least 0.8:1.0. A most desirable cubic form of anatase titanium dioxide is included. The products are formed by hydrolyzing a solution containing TiOCl 2 species under autothermal pressure.
Inventors
- 👤 William J. Jones
- 👤 Ian P. Appleyard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:23
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0536; C01P; C01P2004/00; C01P2004/30; C01P2004/38; C01P2004/54; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
Fine particulate material consisting essentially of titanium dioxide the particles of which have a cross-section which is substantially rectangular so that the particles have a width to length ratio of at least 0.8:1.0 and that the particles have an average particle size of from 10 nm to 250 nm.
Claim 2
Dependent Claim
49 words
Fine particulate material consisting essentially of titanium dioxide the particles of which have a cross-section which is substantially rectangular so that the particles have a width to length ratio of at least 0.8:1.0 and that the particles have an average particle size of from 10 nm to 250 nm.
Claim 3
Dependent Claim
24 words
Fine particulate material according to claim 1 in which at least 80% by weight of the titanium dioxide is present in the anatase form.
Claim 4
Dependent Claim
24 words
Fine particulate material according to claim 1 in which at least 95% by weight of the titanium dioxide is present in the anatase form.
Claim 5
Dependent Claim
20 words
Fine particulate material according to claim 1 in which the particles have a thickness similar in size to the width.
Claim 6
Dependent Claim
21 words
Fine particulate material according to claim 1 in which the ratio of the width to the length is at least 0.9:1.
Claim 7
Dependent Claim
23 words
Fine particulate material according to claim 1 in which the particles have an average particle size of from 200 nm to 230 nm.
Claim 8
Dependent Claim
91 words
Fine particulate material consisting essentially of titanium dioxide the particles of which have a cross-section which is substantially rectangular so that the particles have a width to length ratio of at least 0.8:1.0 and that the particles have an average particle size of from 10 nm to 250 nm. material prepared by a method comprising heating under auto-thermal pressure a solution containing TiOCl 2 species in the presence of fluoride ions and nuclei formed of titanium dioxide or a hydrate thereof to hydrolyze said TiOCl 2 species to precipitate titanium dioxide.
Claim 9
Dependent Claim
91 words
Fine particulate material consisting essentially of titanium dioxide the particles of which have a cross-section which is substantially rectangular so that the particles have a width to length ratio of at least 0.8:1.0 and that the particles have an average particle size of from 10 nm to 250 nm. material prepared by a method comprising heating under auto-thermal pressure a solution containing TiOCl 2 species in the presence of fluoride ions and nuclei formed of titanium dioxide or a hydrate thereof to hydrolyze said TiOCl 2 species to precipitate titanium dioxide.
Claim 10
Dependent Claim
44 words
Particulate material according to claim 7, wherein said solution containing said TiOCl 2 is prepared by digesting a titaniferous ore with hydrochloric acid at a temperature greater than 60° C. until the desired level of extraction of the titanium within the ore has occurred.
Claim 11
Dependent Claim
27 words
Particulate material according to claim 7, wherein said solution containing said TiOCl 2 species is obtained by hydrolyzing a titanium halide in water acidified with hydrochloric acid.
References Cited (Backward Citations)
CA658984A
Cited
US3338677A
Cited
CA782530A
Cited
US2489246A
Cited
GB861802A
Cited
US3329484A
Cited
GB1142974A
Cited
US3709984A
Cited
US3579310A
Cited
US3632527A
Cited
US3549322A
Cited
US3796793A
Cited
US3703357A
Cited
US3923968A
Cited
US3856929A
Cited
US3892897A
Cited
US3984524A
Cited
US4095993A
Cited
JPS55113625A
Cited
US4623396A
Cited
US4663305A
Cited
US4885034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |