Electricity: electrical systems and devices – Electrolytic systems or devices – Liquid electrolytic capacitor
Reexamination Certificate
2001-01-11
2002-10-08
Dinkins, Anthony (Department: 2831)
Electricity: electrical systems and devices
Electrolytic systems or devices
Liquid electrolytic capacitor
C361S528000, C029S025030, C428S702000
Reexamination Certificate
active
06462934
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to niobium and oxides thereof and more particularly relates to niobium oxides and methods to at least partially reduce niobium oxide and further relates to oxygen reduced niobium.
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 niobium oxide which includes the steps of heat treating the niobium oxide in the presence of a getter material and in an atmosphere which permits the transfer of oxygen atoms from the niobium oxide to the getter material for a sufficient time and temperature to form an oxygen reduced niobium oxide.
The present invention also relates to oxygen reduced niobium oxides which preferably have beneficial properties, especially when formed into an electrolytic capacitor anode. For instance, a capacitor made from the oxygen reduced niobium oxide of the present invention can have a capacitance of up to about 200,000 CV/g or more. Further, electrolytic capacitor anodes made from the oxygen reduced niobium oxides of the present invention can have a low DC leakage. For instance, such a capacitor can have a DC leakage of from about 0.5 nA/CV to about 5.0 nA/CV.
Accordingly, the present invention also relates to methods to increase capacitance and reduce DC leakage in capacitors made from niobium oxides, which involves partially reducing a niobium oxide by heat treating the niobium oxide in the presence of a getter material and in an atmosphere which permits the transfer of oxygen atoms from the niobium oxide to the getter material, for a sufficient time and temperature to form an oxygen reduced niobium oxide, which when formed into a capacitor anode, has reduced DC leakage and/or increased capacitance.
The present invention further relates to capacitor anodes containing the niobium oxides of the present invention and having other beneficial properties.
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: 2443254 (1948-06-01), Kroll et al.
patent: 2621137 (1952-12-01), Miller
patent: 2700606 (1955-01-01), 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: 3647420 (1972-03-01), Restelli
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: 4406699 (1983-09-01), Beck et al.
patent: 4428856 (1984-01-01), Boyarina et al.
patent: 4722756 (1988-02-01), Hard
patent: 4748737 (1988-06-01), Charles 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: 5171379 (1992-12-01), Kumar et al.
patent: 5412533 (1995-05-01), Murayama et al.
patent: 5448447 (1995-09-01), Chang
patent: 5825611 (1998-10-01), Pozdeev
patent: 5993513 (1999-11-01), Fife
patent: 6007597 (1999-12-01), Puopolo et al.
patent: 6051044 (2000-04-01), Fife
patent: 6051326 (2000-04-01), Fife
patent: 6322912 (2001-11-01), Fife
patent: 104631 (1937-08-01), None
patent: 485318 (1938-05-01), None
patent: 489742 (1938-08-01), None
patent: 835316 (1960-05-01), None
patent: WO 00/15556 (1999-09-01), None
patent: WO 00/15555 (2000-03-01), None
Abstract Document No. 129:284714, 1998, no month.
Abstract Document No. 129:130191, 1998, no month.
Abstract Document No. 128:288971, 1998, no month.
Abstract Document No. 85:170443, 1976, no month.
Abstract Document No. 83:140466, 1975, no month.
Abstract Document No. 104:229152, 1986, no month.
Abstract Document No. 104:198128, 1986, no month.
Abstract Document No. 108:122980, 1988, no month.
Abstract Document No. 106:42412, 1987, no month.
Abstract Document No. 110:224093, 1989, no month.
Abstract Document No. 109:103212, 1988, no month.
Abstract Document No. 116:199338, 1992, no month.
Abstract Document No. 113:10823, 1990, no month.
Abstract Document No. 120:179957, 1994, no month.
Abstract Document No. 119:84165, 1993, no month.
Abstract Document No. 118:86049, 1993, no month.
Acrivos, et al., “Dynamic phenomena in Superconducting oxides Measured by ESR” Phys. Rev. B: Condens. Matter, 50(18), pp. 12710-12723. (1994).
Acrivos, et al., “Dynamics of Flux Motion...” Physica C(Amsterdam) 234-40(Pt. 5), pp. 3159-3160. (1994).
Bauer, George, “The Oxides of Niobium,” Zeitschrift fuer anorganische und allgemeine Chemie, vol. 248, No. 1. (Sep. 1941) (w/full English Translation).
Feschotte, et al., “Niobium Physico-Chemical Properties Of TTS Compounds and Alloys” Atomic Energy Review, Special Issue No. 2. International Atomic Energy Agency—Vienna (1968). pp. 57-59.
International Search Report for PCT/US99/21413 mailed Sep. 16, 1999.
Kuz′micheva, et al., “Superconductivity in Lathanide-Strontium-Niobium-Oxide Systems” Sh. Neorg. Khim. 38(1), 162-6. (1993).
Mellor “Inorganic and Theoretical Chemistry” vol. IX, pp. 856-857, no date.
Pages 59, 65, and 66 of “Encyclopedia of Chemical Technology,” vol. 17, 4thEdition, no date.
Vest et al., “Electrical Conductivity in Ceramics and Glass” Department of the Air Force, Aerospace Research Laboratories Wright-Patterson Air Force Base, Ohio. pp. 375-384. (1974).
Young article, pp. 4 and 5 of Chapter 2, no date, no citation.
U.S. Patent Application No. 09/451,452.
U.S. Patent Application No. 09/347,990.
U.S. Patent Application No. 09/533430.
Fife James A.
Kimmel Jonathon L.
Kitchell. Ricky W.
Cabot Corporation
Dinkins Anthony
LandOfFree
Methods to partially reduce a niobium metal oxide and oxygen... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods to partially reduce a niobium metal oxide and oxygen..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods to partially reduce a niobium metal oxide and oxygen... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2926747