Source: http://www.google.com/patents/US5401596?ie=ISO-8859-1&dq=U.S.+Patent+
Timestamp: 2015-08-02 05:23:17
Document Index: 627881890

Matched Legal Cases: ['Application No. 32', 'Application No. 25', 'Application No. 25', 'Application No. 26', 'Application No. 26', 'Application No. 27', 'Application No. 27', 'Application No. 28', 'Application No. 28']

Patent US5401596 - Hermetically sealed dry accumulator - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe invention is related to hermetically sealed dry accumulators having significantly larger power output per units of mass in a proportionately smaller volume. The accumulator includes one electrode comprising copper, cadmium, zinc, nickel, or iron, and another electrode of lead dioxide. An immobilized...http://www.google.com/patents/US5401596?utm_source=gb-gplus-sharePatent US5401596 - Hermetically sealed dry accumulatorAdvanced Patent SearchPublication numberUS5401596 APublication typeGrantApplication numberUS 07/960,131Publication dateMar 28, 1995Filing dateOct 13, 1992Priority dateOct 14, 1991Fee statusLapsedAlso published asUS5376348Publication number07960131, 960131, US 5401596 A, US 5401596A, US-A-5401596, US5401596 A, US5401596AInventorsGeorgi T. Stoilov, Vladimir G. Stoilov, Boiko G. Stoilov, Christo T. Chervenkov, Pavel A. LazovOriginal AssigneeStoilov; Georgi T., Stoilov; Vladimir G., Stoilov; Boiko G., Chervenkov; Christo T., Lazov; Pavel A.Export CitationBiBTeX, EndNote, RefManPatent Citations (28), Non-Patent Citations (19), Referenced by (11), Classifications (13), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetHermetically sealed dry accumulator
US 5401596 AAbstract
1. A hermetically sealed dry accumulator comprising:a case; a negative electrode within said case, said negative electrode comprising a metal selected from the group consisting of copper, cadmium, zinc, nickel and iron; a porous lead dioxide positive electrode within said case; and an electrolyte in contact with the positive and negative electrodes, said electrolyte including a solid silica gel infused with a liquid solution of concentrated sulfuric acid and a metallic sulfate, the metallic sulfate concentration in said liquid solution being at least a substantially saturating concentration. 2. The hermetically sealed dry accumulator of claim 1, and wherein said concentrated sulfuric acid is saturated with said metallic sulfate and the metal of said metallic sulfate is the same as the selected metal of the negative electrode.
14. The hermetically sealed dry accumulator of claim 1, characterized in that the negative electrode includes a copper coated plastic grid;the silica gel is thoroughly wetted with a concentrated solution of copper sulfate and sulfuric acid; and the case surrounding the thoroughly wetted silica gel is hermetically sealed and isolates the silica gel from the ambient atmosphere. 15. A hermetically sealed dry accumulator comprising:a case; a negative electrode within said case, said negative electrode comprising a metal selected from the group consisting of copper, cadmium, zinc, nickel and iron; a porous lead dioxide positive electrode within said case; and an electrolyte in contact with the positive and negative electrodes, said electrolyte including a solid silica gel infused with a liquid solution of concentrated sulfuric acid and a metallic sulfate selected from the group consisting of copper sulphate, cadmium sulphate, zinc sulphate, nickel sulphate and iron sulphate, the metallic sulfate concentration in said liquid solution being at least a substantially saturating concentration. 16. The hermetically sealed dry accumulator of claim 1, wherein said liquid solution comprises at least a supersaturating solution of said metallic sulfate.
In the preferred method of making silica gel especially useful in the electrochemical cell of the present invention, a chemically pure solution of water-glass (Na2 On �SiO2) with a specific gravity of about 1.10 and a chemically pure solution of sulfuric acid having a specific gravity of about 1.20 are contacted in a proportion of about 100 to 15 parts by volume. The water-glass is poured onto the surface of the sulfuric acid while it is gently and continuously stirred in a glass vessel. A chemical reaction takes place between the water-glass and the sulfuric acid which produces water, sodium sulfate, and silica. Small particles of silica are produced in the aqueous solution and form a colloid.
The colloid is removed and placed on specially perforated dishes to hasten coagulation. The colloid is held at a temperature in the range of about 20� C. to about 25� C. for a period of about 24 hours during which the colloid, which had the appearance of a gelled mass, coagulates into a solid. The solid then is crushed between rollers to produce particles having a size distribution such that at least about 90% of the particles can pass through a 1 mm mesh sieve. The particles are maintained at a temperature of about 30� C. to 40� C., such as by infra-red lamps, with constant stirring until the particles of silica gel contain relatively little moisture.
The dried particles of silica gel are next treated with a 3 weight percent sulfuric acid solution and then washed with distilled water separately, as necessary, until essentially no sodium sulfate or sulfuric acid can be detected by conventional laboratory means in the wash water. The washed particles are separated from the wash water by filtration, preferably vacuum filtration, and dried again, as in ovens fitted with infra-red lamps, at a temperature of about 100� C. for a period of from about 6 to about 10 hours. After the second drying, the silica gel particles are placed in air-tight plastic or glass vessels until use.
During operation the silica gel is infused with an oversaturated solution of metallic sulphate in concentrated sulfuric acid. It is preferred that the solution be chemically oversaturated with the metallic sulphate. If the hermetically sealed dry accumulator of the present invention is operated with a liquid solution that contains less than a saturating amount of the metallic sulphate the cell will exhibit relatively shorter service life. The liquid solution is prepared by adding concentrated sulfuric acid to metal sulphate at 90� C. while stirring. The resulting slurry is then cooled to room temperature and the supernatant liquid is drawn and employed as electrolyte.
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Munichandraiah et al., Insoluble Anode of Porous Lead Dioxide for Electrosynthesis: Preparation and Characterization , Journal of Applied Electrochemistry 17 (1987) pp. 22 32.11 *Provisionally Published Federal Republic Patent Application No. 32 33 423; filed Sep. 9, 1982; Published Mar. 15, 1984.12Provisionally Published German Federal Republic Patent Application No. 25 41 239, Filed Sep. 16, 1975, "Elektrischer Akkumulator".13 *Provisionally Published German Federal Republic Patent Application No. 25 41 239, Filed Sep. 16, 1975, Elektrischer Akkumulator .14Provisionally Published German Federal Republic Patent Application No. 26 56 506, filed Dec. 14, 1976, "Positive Elektrode fur Bliakkumulatoren".15 *Provisionally Published German Federal Republic Patent Application No. 26 56 506, filed Dec. 14, 1976, Positive Elektrode fur Bliakkumulatoren .16Provisionally Published German Federal Republic Patent Application No. 27 15 628, filed Apr. 7, 1977, "Positive Elektrode fur Bleiakkumulatoren".17 *Provisionally Published German Federal Republic Patent Application No. 27 15 628, filed Apr. 7, 1977, Positive Elektrode fur Bleiakkumulatoren .18Provisionally Published German Federal Republic Patent Application No. 28 49 311, filed Nov. 14, 1978, "Verhfahren zur Herstellung Positive and Negative Elektroden fur Bleiakkumulaatoren".19 *Provisionally Published German Federal Republic Patent Application No. 28 49 311, filed Nov. 14, 1978, Verhfahren zur Herstellung Positive and Negative Elektroden fur Bleiakkumulaatoren .* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5882721 *May 1, 1997Mar 16, 1999Imra America IncProcess of manufacturing porous separator for electrochemical power supplyUS5948464 *Jun 19, 1996Sep 7, 1999Imra America, Inc.Process of manufacturing porous separator for electrochemical power supplyUS6148503 *Mar 31, 1999Nov 21, 2000Imra America, Inc.Process of manufacturing porous separator for electrochemical power supplyUS6316142Mar 31, 1999Nov 13, 2001Imra America, Inc.Electrode containing a polymeric binder material, method of formation thereof and electrochemical cellUS7038901Feb 11, 2005May 2, 2006Wilson Greatbatch Technologies, Inc.Silicate additives for capacitor working electrolytesUS7650840Feb 6, 2006Jan 26, 2010Dyno Nobel Inc.Delay units and methods of making the sameUS7682738Feb 7, 2003Mar 23, 2010Kvg Technologies, Inc.Lead acid battery with gelled electrolyte formed by filtration action of absorbent separators and method for producing itUS8245643Nov 20, 2009Aug 21, 2012Dyno Nobel Inc.Delay units and methods of making the sameUS8399134Nov 20, 2007Mar 19, 2013Firefly Energy, Inc.Lead acid battery including a two-layer carbon foam current collectorUS8794152Mar 9, 2011Aug 5, 2014Dyno Nobel Inc.Sealer elements, detonators containing the same, and methods of makingUS20090269658 *Dec 31, 2004Oct 29, 2009Shukla Ashok KGrid for Lead-Acid Battery with Electroconductive Polymer Coating* Cited by examinerClassifications U.S. Classification429/302, 429/204, 429/222, 429/221, 429/229, 429/228, 429/227, 429/220, 429/223, 429/234International ClassificationC01B33/154Cooperative ClassificationC01B33/154European ClassificationC01B33/154Legal EventsDateCodeEventDescriptionOct 27, 1993ASAssignmentOwner name: KAMINA LTD., BULGARIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STOILOV, GEORGI TODOROV;STOILOV, VLADIMIR GEORGIEV;STOILOV, BOIKO GEORGIEV;AND OTHERS;REEL/FRAME:006747/0105;SIGNING DATES FROM 19920923 TO 19920929Dec 1, 1993ASAssignmentOwner name: KAMINA LTD., BULGARIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STOILOV, GEORGI TODOROV;STOILOV, VLADIMIR GEORGIEV;STOILOV, BOIKO GEORGIEV;AND OTHERS;REEL/FRAME:006801/0704;SIGNING DATES FROM 19920923 TO 19920929Dec 1, 1993AS02Assignment of assignor's interestOct 20, 1998REMIMaintenance fee reminder mailedMar 28, 1999LAPSLapse for failure to pay maintenance feesJun 8, 1999FPExpired due to failure to pay maintenance feeEffective date: 19990328RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services