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| Number | Title | Issue Date |
| 7231722 | Lay out line A chalk line apparatus for marking regularly spaced locations. The apparatus comprises a casing for powdered chalk containing a rotatable reel, a wire rope wound on said reel, and an exit opening for the wire rope at one end of the holder. The wire rope is coated wi... | 06/19/2007 |
| 6840980 | Method for eliminating bismuth from molten lead by adding calcium-magnesium alloys A method for eliminating bismuth from molten lead with calcium and magnesium, in which the addition of calcium and magnesium is made in the form of lumps two Mg—Ca alloys, one containing predominantly Mg, the other containing predominantly Ca, each having a liquid... | 01/11/2005 |
| 5223021 | Iron as a co-additive in refining crude lead bullion A process for using iron metal or an iron-containing sulfide reagent as a co-additive to extend the usefulness of sodium in refining crude lead bullion.... | 06/29/1993 |
| 5183497 | Iron and a copper speiss as co-additives in refining crude lead bullion A process for using an iron-containing sulfide reagent and a previously formed copper speiss as joint co-additives to extend the usefulness of the sodium in refining crude bullion which has less than about 1.3 wt. % sulfur.... | 02/02/1993 |
| 5183496 | Copper speiss as a co-additive in refining crude lead bullion Previously formed copper speiss in an amount of about 6.5% by weight is a co-additive which extends the usefulness of sodium in refining crude lead bullion, which has a sulfur content generally less than about 1.3% by weight.... | 02/02/1993 |
| 5100466 | Process for purifying lead using calcium/sodium filter cake A method for processing crude lead bullion using a reactive metal mixture intermediate by-product having sodium and calcium includes the steps of pouring molten crude lead bullion from a blast furnace into a casting vessel, cooling the crude lead bullion ... | 03/31/1992 |
| 5041160 | Magnesium-calcium alloys for debismuthizing lead A novel alloy for use in lead refining is disclosed comprised substantially of magnesium and calcium. The preferred ratio on a weight basis of magnesium to calcium is between about 1.2:1 to about 5.2:1. A method of refining a lead bath with the novel allo... | 08/20/1991 |
| 4881971 | Refining of lead-debismuthizing A method of removing bismuth from lead wherein the lead is melted, barium is dissolved in the lead optionally with magnesium, calcium or strontium, the melt is cooled, and dross which contains barium is removed from the melt. The barium is preferably adde... | 11/21/1989 |
| 4707911 | Porous electrodes and method of making same Porous electrodes are provided for lead-acid storage batteries without supporting plates or grids. The electrodes are porous, self-supporting, structurally integral and electrically continuous. Lead-acid batteries incorporating such electrodes exhibit imp... | 11/24/1987 |
| 4521247 | Low temperature, non-SO2 polluting, kettle process for separation of lead from lead sulfide-containing material Lead is separated from material containing lead sulfide, e.g., galena ore concentrate, by a substantially autogenous process involving establishing a pool of molten lead in a kettle, adding a metallic alkali metal, e.g., metallic sodium, to the molten lea... | 06/04/1985 |
| 4425160 | Refining process for removing antimony from lead bullion An improved process for refining lead bullion containing antimony, in which the bullion is initially heated in a refining vessel to about 25° F. (14° C.) above the bullion melting point, and is thereafter kept molten primarily by exothermic process reac... | 01/10/1984 |
| 4410361 | Method for desilverizing and removal of other metal values from lead bullion A batch process for desilverizing and refining lead bullion containing antimony and a low silver content, including the steps of melting the lead bullion, adding calcium to form a floating silver-rich dross containing a silver-antimony-calcium compound an... | 10/18/1983 |
| 4404026 | Process for separation of dross elements combining sodium addition to molten bullion followed by controlled solidification of casting A method for the introduction of sodium into lead bullion followed by controlled solidification results in higher recovery of lead from the matte and speiss, and the elimination of the expensive undesirable dross reverberatory practice.... | 09/13/1983 |
| 4356033 | Process for refining metals by drossing procedures A process for refining metals, such as lead and tin, by removal of impurities as a dross or crust, in which a cooling medium is applied to the surface of a melt of the metal and, simultaneously with cooling, stirring the melt.... | 10/26/1982 |
| 4042228 | Apparatus for debismuthising lead Apparatus for debismuthising lead containing one or more alkaline earth metals or alloys thereof, including a separation vessel having independently temperature-controlled upper liquation and lower separation zones, devices for adding a reagent selected f... | 08/16/1977 |
