US4859448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing powdered barium titanate
Assignee: US Philips Corp
•
Filing: 1988-06-20
•
Granted: 1989-08-22
•
Expires: 2008-06-20
Abstract
Abstract A method of manufacturing powdered barium titanate, in which titanium dioxide is made to react with barium hydroxide, excluding CO 2 at a temperature in the range from 60° to 95° C., amorphous titanium dioxide having a water content of ≈0.5 mol. being made to react with excess barium hydroxide in water, and being dried after removing the excess barium ions.
Inventors
- 👤 Mareike K. Klee
- 👤 Hans-Wolfgang Brand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:19
CPC Classifications
C; C01; C01G; C01G23/00; B; B82; B82Y; B82Y30/00; C01G23/003; C01G23/006; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/76; C01P2004/00; C01P2004/60; C01P2004/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A method of manufacturing powdered barium titanate powder, said method comprising the steps: (a) refluxing at a temperature of between 70° C.-95° C. an aqueous suspension of an amorphous titanium dioxide power having a bound water content of ≃0.5 mol and barium hydroxide in excess while excluding CO 2 to thereby form barium titanate, (b) removing barium titanate powder from the suspension, (c) removing excess barium ions from the barium titanate power and, (d) then drying the barium titanate powder.
Claim 2
Independent Claim
80 words
A method of manufacturing powdered barium titanate powder, said method comprising the steps: (a) refluxing at a temperature of between 70° C.-95° C. an aqueous suspension of an amorphous titanium dioxide power having a bound water content of ≃0.5 mol and barium hydroxide in excess while excluding CO 2 to thereby form barium titanate, (b) removing barium titanate powder from the suspension, (c) removing excess barium ions from the barium titanate power and, (d) then drying the barium titanate powder.
Claim 3
Dependent Claim
83 words
A method of claim 1 wherein the amorphous titanium dioxide powder is manufactured by hydrolyzing a titanium alcoholate by adding deionized water to a solution of a titanium alcholate to thereby precipitate out an amorphous titanium dioxide power having a bound water content of ≃0.5 mol, separating said titanium dioxide powder from said solution, washing said titanium dioxide powder with a washing solution, separating the washing solution from said titanium dioxide powder and, without drying, employing said titanium dioxide powder in said method.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein Ba(OH) 2 .8H 2 O is used as the supply of the barium hydroxide.
Claim 5
Dependent Claim
20 words
The method of claim 2 wherein the solution of the titanium alcoholate is a solution of titanium tetraethoxide in m-xylol.
References Cited (Backward Citations)
US2218655A
Cited
GB530584A
Cited
GB715762A
Cited
US3413083A
Cited
EP0104002A1
Cited
US4636378A
Cited
US4764493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |