Patent US3929501A successfully refreshed from Google Patents.
US3929501A
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Novel titanium dioxide composition
Assignee: Titanium Technology NV
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Filing: 1973-06-04
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Granted: 1975-12-30
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Expires: 1993-06-04
Abstract
Abstract Claimed is a novel titanium dioxide composition having 95.0 to 99.5%, by weight, of titanium dioxide, no more than 1.0%, by weight, of iron oxides, a bulk density in the range of 1.73 to 2.4 g./cc., a hardness (VHN) of 337-650, and a porosity of 0.03 to 0.08 cc./g. produced by passing chlorine through a deep bed of titaniferous ore-carbon mixture containing about 25%, by weight, of carbon at a temperature of about 900* to 1100*C. The product is particularly useful as a raw material for producing titanium dioxide pigment but is also useful as a white pigment as such.
Inventors
- 👤 Jr Wendell E Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:51
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1209
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
A NOVEL TITANIUM DIOXIDE COMPRISING 95.0 TO 99.5 PERCENT, BY WEIGTH, OF TITANIUM DIOXIDE, UP TO 1.0 PERCENT, BY WEIGHT OF A COMBINATION IRON OXIDE AND READILY CHLORINATED METAL OXDES AND THE REMAINDER SILICATES AND OTHER DIFFICULTY CHLORINATED OXIDES, SAID COMPOSITION OF MATTER HAVING A BULK DENSITY IN THE RANGE OF 1.73 TO 2.4 GRMAS PER CUBIC CENTIMETER, A HARDNESS (VHN) OF 337-650 AND A POROSITY OF 0.03 TO 0.08 CC/G.
Claim 2
Dependent Claim
71 words
A NOVEL TITANIUM DIOXIDE COMPRISING 95.0 TO 99.5 PERCENT, BY WEIGTH, OF TITANIUM DIOXIDE, UP TO 1.0 PERCENT, BY WEIGHT OF A COMBINATION IRON OXIDE AND READILY CHLORINATED METAL OXDES AND THE REMAINDER SILICATES AND OTHER DIFFICULTY CHLORINATED OXIDES, SAID COMPOSITION OF MATTER HAVING A BULK DENSITY IN THE RANGE OF 1.73 TO 2.4 GRMAS PER CUBIC CENTIMETER, A HARDNESS (VHN) OF 337-650 AND A POROSITY OF 0.03 TO 0.08 CC/G.
Claim 3
Dependent Claim
17 words
The composition of claim 1 having a bulk density of 1.8 to 2.4 grams per cubic centimeter.
Claim 4
Dependent Claim
17 words
The composition of claim 1 having a bulk density of 2.0 to 2.4 grams per cubic centimeter.
Claim 5
Dependent Claim
23 words
The composition of claim 1 having up to 0.5 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 6
Dependent Claim
23 words
The composition of claim 1 having up to 0.25 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 7
Dependent Claim
23 words
The composition of claim 1 having up to 0.15 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 8
Dependent Claim
15 words
The composition of claim 1 having 97.0 to 99.5 percent, by weight, of titanium dioxide.
Claim 9
Dependent Claim
23 words
The composition of claim 7 having 0 to 0.5 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 10
Dependent Claim
23 words
The composition of claim 7 having 0 to 0.25 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 11
Dependent Claim
23 words
The composition of claim 7 having 0 to 0.15 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 12
Dependent Claim
14 words
The composition of claim 1 having 98 to 99.5 percent, by weight, titanium dioxide.
Claim 13
Dependent Claim
23 words
The composition of claim 11 having 0 to 0.5 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 14
Dependent Claim
23 words
The composition of claim 11 having 0 to 0.25 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 15
Dependent Claim
23 words
The composition of claim 11 having 0 to 0.15 percent, by weight, of a combination of iron oxide and readily chlorinated metal oxides.
Claim 16
Dependent Claim
54 words
The composition of claim 1 having 96.5 percent, by weight, of titanium dioxide, 0.17 percent, by weight, of iron oxide and other readily chlorinated metal oxides, the remainder of silicates and other difficultly chlorinated oxides said composition having a bulk density of 1.73, a VHN hardness of 435 and a porosity of 0.075 cc/g.
Claim 17
Dependent Claim
21 words
The composition of claim 2 having a VHN hardness of 375 to 650, and a porosity of 0.03 to 0.07 cc/g.
Claim 18
Dependent Claim
21 words
The composition of claim 3 having a VHN hardness of 450 to 650 and a porosity of 0.03 to 0.05 cc/g.
Claim 19
Dependent Claim
28 words
The composition of claim 1 having a bulk density of 1.9 to 2.4, a VHN hardness of 400 to 650, and a porosity of 0.03 to 0.06 cc/g.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |