Electrolytic capacitor anode of valve metal oxide

Details Electrolytic capacitor anode of valve metal oxide Electrolytic capacitor anode of valve metal oxide

1999-09-15

2001-11-27

Bos, Steven (Department: 1754)

Stock material or miscellaneous articles

Composite

Of inorganic material

C361S528000, C361S529000

Reexamination Certificate

active

06322912

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to valve metals, other metals, and oxides thereof and more particularly relates to methods to at least partially reduce metal oxides and further relates to oxygen reduced valve metals and other metals.
SUMMARY OF THE PRESENT INVENTION
In accordance with the purposes of the present invention, as embodied and described herein, the present invention relates to a method to at least partially reduce a metal oxide selected from a valve metal oxide, which includes the steps of heat treating the metal oxide in the presence of a getter material like a tantalum and/or niobium getter material or other getter material capable of reducing the metal oxide, in an atmosphere which permits the transfer of oxygen atoms from the metal oxide to the getter material, for sufficient time and temperature to form an oxygen reduced valve metal oxide.
The present invention also relates to oxygen reduced valve metal oxides which preferably have beneficial properties, especially when formed into an electrolytic capacitor anode. For instance, a capacitor made from the oxygen reduced valve metal oxide of the present invention can have a capacitance of from about 1,000 CV/g or less to about 200,000 CV/g or more. Further, electrolytic capacitor anodes made from the oxygen reduced valve metal oxides of the present invention can have a low DC leakage. For instance, such a capacitor can have a DC leakage of from about 5.0 nA/CV to about 0.5 nA/CV.
Accordingly, the present invention also relates to methods to increase capacitance and reduce DC leakage in capacitors made from valve metal oxides, which involves partially reducing a valve metal oxide by heat treating the valve metal oxide in the presence of a getter material, like tantalum and/or niobium getter material, in an atmosphere which permits the transfer of oxygen atoms from the metal oxide to the getter material for a sufficient time and temperature to form an oxygen reduced valve metal oxide, which when formed into a capacitor anode, has reduced DC leakage and/or increased capacitance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the present invention, as claimed.


REFERENCES:
patent: 1415516 (1922-05-01), Bridge
patent: 1906184 (1933-04-01), Bohn
patent: 2183517 (1939-12-01), Leemans et al.
patent: 2242759 (1941-05-01), Schlecht et al.
patent: 2621137 (1952-12-01), Miller
patent: 2700606 (1955-12-01), Wilhelm et al.
patent: 2761776 (1956-09-01), Bichowsky
patent: 2861882 (1958-11-01), Bichowsky
patent: 2937939 (1960-05-01), Wilhelm et al.
patent: 2992095 (1961-07-01), Li
patent: 3421195 (1969-01-01), Berryhill
patent: 3926832 (1975-12-01), Barosi
patent: 4032328 (1977-06-01), Hurd
patent: 4126493 (1978-11-01), Wurm
patent: 4201798 (1980-05-01), Lindmayer
patent: 4428856 (1984-01-01), Boyarina et al.
patent: 4722756 (1988-02-01), Hard
patent: 4916576 (1990-04-01), Herbert et al.
patent: 4923531 (1990-05-01), Fisher
patent: 4960471 (1990-10-01), Fife
patent: 5013357 (1991-05-01), Worcester et al.
patent: 5022935 (1991-06-01), Fisher
patent: 5142452 (1992-08-01), Saiki
patent: 5412533 (1995-05-01), Murayama et al.
patent: 5448447 (1995-09-01), Chang
patent: 5822177 (1998-10-01), Popp et al.
patent: 5825611 (1998-10-01), Pozdeev
patent: 5922215 (1999-07-01), Pless et al.
patent: 5949639 (1999-09-01), Maeda et al.
patent: 6088217 (2000-07-01), Patel et al.
patent: 104631 (1937-08-01), None
patent: 485318 (1938-05-01), None
patent: 489742 (1938-08-01), None
patent: 835316 (1960-05-01), None
Abstract Document No. 129;284714.
Abstract Document No. 129:130191.
Abstract Document No. 128:288971.
Abstract Document No. 85:170443.
Abstract Document No. 83:140466.
Abstract Document No. 104:229152.
Abstract Document No. 104:198128.
Abstract Document No. 108:122980.
Abstract Document No. 106:42412.
Abstract Document No. 110:224093.
Abstract Document No. 103212.
Abstract Document No. 116:199338.
Abstract Document No. 113:10823.
Abstract Document No. 120:179957.
Abstract Document No. 119:84165.
Abstract Document No. 118:86049.
Pages 59, 65, and 66 of Encyclopedia of Chemical Technology, vol. 17, 4thEdition, 1996, No month.
Mellor “Inorganic and Theoretical Chemistry” vol. IX, pp. 856-857, No date.
Young article, pp. 4 and 5 of Chapter 2, No date.
International Search Report for PCT/US99/21413 mailed Sep. 16, 1999.

Affiliated with

Also associated with

Rating

Electrolytic capacitor anode of valve metal oxide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrolytic capacitor anode of valve metal oxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrolytic capacitor anode of valve metal oxide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2573116