Patents Represented by Attorney Robert F. Dropkin
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Patent number: 4464206Abstract: A process for producing a wrought product of improved ductility from substantially noncompactible prealloyed metal powder. The process comprises the steps of: comminuting substantially noncompactible prealloyed metal powder so as to flatten the particles thereof; heating the comminuted particles of metal powder at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of metal powder; compacting the crushed mass of metal powder; sintering the metal powder; and hot working the metal powder into a wrought product. The wrought product has a chemistry which is substantially the same, with the exception of carbon and certain residuals, as the chemistry of the prealloyed powder.Type: GrantFiled: November 25, 1983Date of Patent: August 7, 1984Assignee: Cabot CorporationInventors: Prabhat Kumar, Ronald D. Rivers, Anthony J. Hickl
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Patent number: 4459707Abstract: An ear protecting device for protecting a wearer from annoying and/or damaging noise levels. The device is comprised of a connecting member and a pair of muffs suitable for covering a wearer's ears. The muffs are suspended from opposite portions of the connecting member. The muffs are permeable to water vapor. Each said muff is at least partially porous. Each said muff has a specific airflow resistance of at least 15,000 SI rayls. Each said muff has a permeance of at least 2 metric perms.Type: GrantFiled: August 23, 1982Date of Patent: July 17, 1984Assignee: Cabot CorporationInventor: John P. Stallings
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Patent number: 4460542Abstract: A high temperature oxidation resistant alloy. The alloy consists essentially of, by weight, from 14 to 18% chromium, from 4 to 6% aluminum, from 1.5 to 8% iron, a small but effective yttrium content not exceeding 0.04%, up to 12% cobalt, up to 1% manganese, up to 1% molybdenum, up to 1% silicon, up to 0.25% carbon, up to 0.03% boron, up to 1% tungsten, up to 1% tantalum, up to 0.5% titanium, up to 0.5% hafnium, up to 0.5% rhenium, up to 0.04% of elements from the group consisting of elements 57 through 71 of the periodic table of the elements, balance essentially nickel. The nickel plus the cobalt content is at least 66%. The iron content is in accordance with the relationship, Fe .gtoreq.3+4 (%Al-5), when the aluminum content is at least 5%.Type: GrantFiled: May 24, 1982Date of Patent: July 17, 1984Assignee: Cabot CorporationInventor: Robert B. Herchenroeder
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Patent number: 4425168Abstract: A process for producing a copper beryllium alloy. The process includes the steps of: preparing a copper beryllium melt; casting the melt; hot working the cast copper beryllium; annealing the copper beryllium; cold working the annealed copper beryllium; and hardening the copper beryllium; and is characterized by the improvement comprising the steps of: solution annealing the cold worked copper beryllium at a temperature of from 1275.degree. (691.degree.) to 1375.degree. F. (746.degree. C.); hardening the annealed copper beryllium at a temperature of from 400.degree. (204.degree.) to 580.degree. F. (304.degree. C.); cold rolling the hardened copper beryllium; and stress relief annealing the cold worked copper beryllium at a temperature of from 400.degree. (204.degree.) to 700.degree. F. (371.degree. C.).An alloy consisting essentially of, in weight percent, from 0.4 to 2.5% beryllium, up to 3.5% of material from the group consisting of cobalt and nickel, up to 0.Type: GrantFiled: September 7, 1982Date of Patent: January 10, 1984Assignee: Cabot CorporationInventors: Sherwood Goldstein, Henry T. McClelland, Paul J. Scherbner
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Patent number: 4423014Abstract: A pregnant liquor is mixed with an organic mixture comprised of an organic extracting agent and iso-butyl-heptyl ketone. Metallic values are absorbed from the pregnant liquor by the organic mixture. The metal-bearing organic mixture is then separated from the liquor and stripped of its metallic values.Type: GrantFiled: January 21, 1981Date of Patent: December 27, 1983Assignee: Cabot CorporationInventors: Alkis S. Rappas, Lloyd R. Allen
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Patent number: 4394185Abstract: A process for producing formed copper beryllium alloys. The process includes the steps of: preparing a copper beryllium melt; casting the melt; hot working the cast copper beryllium; solution annealing the copper beryllium; optionally cold working the solution annealed copper beryllium; forming the copper beryllium; and age hardening the formed copper beryllium; and the improvement comprising the step of preaging the solution annealed or solution annealed and cold worked copper beryllium, prior to forming, at a temperature of from 400.degree. to 1000.degree. F. for a period of up to 180 seconds, the copper beryllium being at final gauge prior to preaging.Type: GrantFiled: March 30, 1982Date of Patent: July 19, 1983Assignee: Cabot Berylco, Inc.Inventors: Henry T. McClelland, Joseph B. Kuhn
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Patent number: 4354592Abstract: Self-cleaning apparatus for removing material from a rotating drum. Buckets are associated with a scraper which is maintained in a substantially fixed position relative to the local gravitational force vector. The scraper is maintained in said position by means of a counterweight. A scraping action is achieved as the drum and buckets rotate.Type: GrantFiled: August 7, 1980Date of Patent: October 19, 1982Assignee: Cabot CorporationInventors: Allan C. Morgan, Dan K. Puckett
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Patent number: 4353742Abstract: A wear-resistant alloy, which excluding impurities, has the following composition: (a) about 50 to 70% of cobalt, nickel and iron; (b) 27 to 35% of chromium; (c) 5 to 15% of molybdenum and/or tungsten; (d) 0.3 to 2.25% of carbon and/or boron; (e) 0 to 3% of silicon and/or manganese; (f) 0 to 5% of one or more of titanium, hafnium, zirconium, vanadium, niobium, and tantalum; (g) 0 to 5% of copper, and (h) 0 to 5% of one or more of the following rare earths: lanthanum, cerium, yttrium, and thorium. The cobalt is the range 25 to 40%, and the nickel in the range 4 to 12%. There is from 0 to 7.5% of constituents (f), (g) and (h). The iron is present in a quantity not exceeding 25%. If there is 2% or more of carbon and/or boron, there is more than 30% chromium. (All percentages by weight).A welding or surfacing consumable which (ignoring the effect of dilution by substrate) is capable of depositing such an alloy may also be made.Type: GrantFiled: September 20, 1979Date of Patent: October 12, 1982Assignee: Cabot Stellite Europe LimitedInventor: Paul Crook
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Patent number: 4344621Abstract: A practice device for use in the practice of those sports involving the hurling or striking of a ball or other sport projectile toward a specified target. The device of the invention serves to safely arrest the flight of the projectile while informing the user of the exact point of impact of the projectile relative to a defined target zone. The target is a polymeric foam mat having a polymeric sheet bonded to its front face. The sheet removably carries target indicia. Apertures through the foam mat make up 40 to 50 percent of the total surface area of the mat. When a projectile strikes the sheet, an indentation, which lasts from 5 to 60 seconds, indicates the point of impact.Type: GrantFiled: March 3, 1980Date of Patent: August 17, 1982Assignee: E-A-R CorporationInventor: David E. Baker
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Patent number: 4340129Abstract: Disclosed herein is a flexible acoustical laminate construction which can be applied to noisy enclosures in order to attenuate noise therein. The construction of the invention finds particular use as a cabliner for the cabs or crew compartments of heavy construction, industrial, mining and transportation equipment of various types.Type: GrantFiled: May 1, 1980Date of Patent: July 20, 1982Assignee: Cabot CorporationInventor: Edward F. Salyers
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Patent number: 4320094Abstract: Alloy scrap containing refractory metals such as chromium, molybdenum, tungsten, vanadium, niobium and tantalum and base metals such as nickel, cobalt, copper and iron are treated to partition the refractory metal values from the base metal values without an energy intensive remelting step. The scrap in finely divided form is calcined in the presence of an oxygen containing gas and a member of a certain group of alkali metal salts at a temperature in the range of 800.degree. C. to 1150.degree. C. for 1/4 hour to four hours. This treatment converts the refractory metals to alkali metal molybdates, tungstates, chromates, vanadates, niobates and tantalates and the base metals to oxides. The calcined product may then be water leached to produce a substantially base metal-free liquor rich in refractory metal values. Both the refractory and the base metal values may be subsequently recovered by conventional hydrometallurgical techniques.Type: GrantFiled: April 15, 1980Date of Patent: March 16, 1982Assignee: Cabot CorporationInventors: Jameel Menashi, Alkis S. Rappas, Donald A. Douglas
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Patent number: 4305754Abstract: Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt nickel, iron, and copper. The scrap is calcined with sodium carbonate in air to convert the refractory metal values to MoO.sub.4.sup..dbd., VO.sub.4.sup..tbd., WO.sub.4.sup..dbd., CrO.sub.4.sup..dbd., and the base metals to water insoluble oxides. A leach of the calcined materials produces a pregnant liquor rich in refractory metals which, after separation of the vanadium, molybdenum and tungsten values, is treated with CO, CHOO.sup.-, CH.sub.3 OH, or HCHO to reduce Cr.sup.+6 to Cr.sup.+3. The carbonate and bicarbonate salts produced as a byproduct of the reduction are recycled to the calcination stage.As a result of the V, W, and Mo partition, a mixed solid comprising CaO.multidot.nV.sub.2 O.sub.5, CaMoO.sub.4, and CaWO.sub.4 is produced.Type: GrantFiled: April 15, 1980Date of Patent: December 15, 1981Assignee: Cabot CorporationInventors: Alkis S. Rappas, Jameel Menashi, Donald A. Douglas
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Patent number: 4298582Abstract: Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt, nickel, iron, and copper. The scrap is calcined with sodium carbonate in air to convert the refractory metal values to MoO.sub.4.sup.=, VO.sub.4.sup..ident., WO.sub.4.sup.=, and CrO.sub.4.sup.= and the base metals to water insoluble oxides. A leach of the calcined materials produces a pregnant liquor rich in refractory metals which, after separation of the vanadium, molybdenum and tungsten values, is treated with CO, CHOO.sup.-, CH.sub.3 OH, or HCHO to reduce Cr.sup.+6 to Cr.sup.+3. The carbonate and bicarbonate salts produced as a byproduct of the reduction are recycled to the calcination stage.As a result of the V, W, and Mo partition, a mixed solid comprising CaO.nV.sub.2 O.sub.5, CaMoO.sub.4, and CaWO.sub.4 is produced.Type: GrantFiled: April 15, 1980Date of Patent: November 3, 1981Assignee: Cabot CorporationInventors: Jameel Menashi, Alkis S. Rappas, Donald A. Douglas
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Patent number: 4298581Abstract: Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt, nickel, iron, and copper. The scrap is calcined with sodium carbonate in air to convert the refractory metal values to MoO.sub.4.sup.=, VO.sub.4.sup..ident., WO.sub.4.sup.=, and CrO.sub.4.sup.= and the base metals to water insoluble oxides. A leach of the calcined materials produces a pregnant liquor rich in refractory metals which, after separation of the vanadium, molybdenum and tungsten values, is treated with CO, CHOO.sup.- CH.sub.3 OH, or HCHO to reduce Cr.sup.+6 to CR.sup.+3. The carbonate and bicarbonate salts produced as a byproduct of the reduction are recycled to the calcination stage.As a result of the V, W, and Mo partition, a mixed solid comprising CaO.nV.sub.2 O.sub.5, CaMoO.sub.4, and CaWO.sub.4 is produced.Type: GrantFiled: April 15, 1980Date of Patent: November 3, 1981Assignee: Cabot CorporationInventors: Donald A. Douglas, Jameel Menashi, Alkis S. Rappas
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Patent number: 4293355Abstract: Disclosed herein is a tethered earplug construction comprising a pair of plasticized thermoplastic foam earplugs tethered together by one or more flexible plasticized thermoplastic cord elements. Attachment of the cord element to the earplug is achieved by ultrasonic welding.Type: GrantFiled: September 10, 1979Date of Patent: October 6, 1981Assignee: Cabot CorporationInventor: Albert R. Wacker
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Patent number: 4217136Abstract: A substantially non-porous, austenitic stainless steel that is resistant to chloride pitting and sulfuric acid and a method for making it are disclosed. The steel includes from 21-45% manganese, from 10-30% chromium, from 0.85-3% nitrogen, from 0-1% carbon, from 0-2% silicon, and at least two elements selected from 1-3% copper, 1-4% nickel and 1-4% molybdenum with the combined weight of copper, nickel and molybdenum not exceeding 5% of the composition, and the balance iron and residuals, wherein the composition is such that: ##EQU1## The steel is cast and worked to avoid a dwell period in the temperature range of 1000.degree.-1600.degree. F.Type: GrantFiled: January 26, 1979Date of Patent: August 12, 1980Assignee: Allegheny Ludlum Steel CorporationInventor: Albert G. Hartline, III
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Patent number: 4217150Abstract: A substantially non-porous, sulfuric acid resistant austenitic stainless steel and a method for making it are disclosed. The steel includes from 15-45% manganese, from 10-30% chromium, from 1-3% copper, from 0.85-3% nitrogen, from 0-2% silicon, from 0-1% carbon, and the balance iron and residuals. In addition to containing the foregoing elements within the above-noted composition ranges, the alloys must be such that: ##EQU1## The steels are cast and worked to avoid a dwell period in the temperature range 1000-1600.degree. F.Type: GrantFiled: January 26, 1979Date of Patent: August 12, 1980Assignee: Allegheny Ludlum Steel CorporationInventor: Albert G. Hartline, III
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Patent number: 4213804Abstract: A process for producing electromagnetic silicon steel having a cube-on-edge orientation. The process includes the steps of: preparing a melt of silicon steel containing from 0.02 to 0.06% carbon, from 0.0006 to 0.0080% boron, up to 0.0100% nitrogen and from 2.5 to 4% silicon; casting the steel; hot rolling the steel; cold rolling the steel to a thickness no greater than 0.020 inch; heat treating the steel at a temperature between 1550.degree. and 2000.degree. F. in a hydrogen-bearing atmosphere; removing at least 0.02 micron of surface from each side of the steel; heat treating the steel at a temperature between 1300.degree. and 1550.degree. F. in a hydrogen-bearing atmosphere; applying a refractory oxide coating to the steel and final texture annealing the steel.Type: GrantFiled: March 19, 1979Date of Patent: July 22, 1980Assignee: Allegheny Ludlum Industries, Inc.Inventor: Amitava Datta
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Patent number: D262775Type: GrantFiled: August 23, 1979Date of Patent: January 26, 1982Assignee: E-A-R CorporationInventor: Daniel T. Lilley, Jr.
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Patent number: D263022Type: GrantFiled: August 23, 1979Date of Patent: February 16, 1982Assignee: E-A-R CorporationInventors: Daniel T. Lilley, Jr., Elliott H. Berger, John A. Passanisi