Patents by Inventor George A. J. Hartman
George A. J. Hartman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8216189Abstract: A trocar assembly for providing a pressurized insufflation fluid into a patient cavity and for providing sealable access to the patient cavity by a surgical instrument. The assembly comprises an inner tubular member having a proximal end and a distal end. An outer tubular member is disposed about the inner tubular member, the outer tubular member having a proximal end and a distal end. The distal end of the inner tubular member and the distal end of the outer tubular member define a trocar seal nozzle arranged therebetween.Type: GrantFiled: September 8, 2006Date of Patent: July 10, 2012Assignee: SurgiQuest, Inc.Inventors: Jack B. Stubbs, Ronald J. Thompson, George A. J. Hartman, Donald N. Halgren, Michael J. Campbell
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Patent number: 7413559Abstract: A trocar assembly for use in surgery in a patient, comprising an elongated outer tubular member having a first or proximal end and a second or distal end. The proximal end has a housing enclosing a fluid pressure chamber therein. The distal end of the outer tubular member has a gaseous fluid discharge arrangement therethrough, through which a medical instrument is disposed for surgical manipulation of the patient.Type: GrantFiled: September 8, 2006Date of Patent: August 19, 2008Assignee: SurgiQuest, IncorporatedInventors: Jack B. Stubbs, Ronald J. Thompson, George A. J. Hartman, Donald N. Halgren, Michael J. Campbell
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Patent number: 7338473Abstract: A cannula assembly for the maintenance of an operative pneumoperitoneum in a patient comprising an elongated cannula having a proximal end and a distal end. A removable valve is securely arranged in the proximal end of the cannula to provide a seal and minimize the escape of gas introduced into the patient's pneumoperitoneum when an operative instrument is passed therethrough.Type: GrantFiled: February 11, 2004Date of Patent: March 4, 2008Assignee: SurgiQuest, IncorporatedInventors: Michael J. Campbell, Donald N. Halgren, George A. J. Hartman, Ken Parker, Jack B. Stubbs, Ronald J. Thompson
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Patent number: 7285112Abstract: A trocar assembly for use in surgery in a patient, comprising an elongated outer tubular member having a first or proximal end and a second or distal end. The proximal end has a housing enclosing a fluid pressure chamber therein. The distal end of the outer tubular member has a gaseous fluid discharge arrangement therethrough, through which a medical instrument is disposed for surgical manipulation of the patient.Type: GrantFiled: December 18, 2003Date of Patent: October 23, 2007Assignee: SurgiQuest, IncorporatedInventors: Jack B. Stubbs, Ronald J. Thompson, George A. J. Hartman, Donald N. Halgren, Michael J. Campbell
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Patent number: 7182752Abstract: A trocar assembly for providing a pressurized insufflation fluid into a patient cavity and for providing sealable access to the patient cavity by a surgical instrument. The assembly comprises an inner tubular member having a proximal end and a distal end. An outer tubular member is disposed about the inner tubular member, the outer tubular member having a proximal end and a distal end. The distal end of the inner tubular member and the distal end of the outer tubular member define a trocar seal nozzle arranged therebetween.Type: GrantFiled: May 17, 2003Date of Patent: February 27, 2007Assignee: Surgiquest, IncorporatedInventors: Jack B. Stubbs, Ronald J. Thompson, George A. J. Hartman, Donald N. Halgren, Michael J. Campbell
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Publication number: 20040204671Abstract: A trocar assembly for providing a pressurized insufflation fluid into a patient cavity and for providing sealable access to the patient cavity by a surgical instrument. The assembly comprises an inner tubular member having a proximal end and a distal end. An outer tubular member is disposed about the inner tubular member, the outer tubular member having a proximal end and a distal end. The distal end of the inner tubular member and the distal end of the outer tubular member define a trocar seal nozzle arranged therebetween.Type: ApplicationFiled: May 17, 2003Publication date: October 14, 2004Inventors: Jack B. Stubbs, Ronald J. Thompson, George A. J. Hartman, Donald N. Halgren, Michael J. Campbell
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Patent number: 4427235Abstract: A method of solution mining wherein a lixiviant containing both leaching and oxidizing agents is injected into the subsurface orebody. The composition of the lixiviant is changed by reducing the level of oxidizing agent to zero so that soluble species continue to be removed from the subsurface environment. This reduces the uranium level of the ground water acquifier after termination of the lixiviant injection.Type: GrantFiled: January 19, 1981Date of Patent: January 24, 1984Assignee: Ogle Petroleum Inc. of CaliforniaInventor: George J. Hartman
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Patent number: 4230678Abstract: An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a first leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing thereiType: GrantFiled: February 14, 1979Date of Patent: October 28, 1980Assignees: Earth Sciences, Inc., National Steel Corporation, Southwire CompanyInventors: George J. Hartman, Vernon R. Ewing
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Patent number: 4064217Abstract: An improvement in the process for recovering aluminum from alunite ore disclosed in U.S. Pat. Nos. 3,890,425 and 3,890,426, the improvement being in the recovery of potassium sulfate by crystallization from the leaching solution resulting from potassium hydroxide leaching of the roasted ore, the improvement consisting of adding potassium hydroxide to the concentrated leach liquor prior to crystallization to increase the concentration of the potassium ion so that increased recoveries of potassium sulfate are obtained at a given temperature over those obtained when this procedure is not used. By this procedure a yield is obtained at a temperature below that which is required to obtain the same yield when potassium hydroxide is not used so that the high temperatures formerly necessary to hold enough potassium sulfate in solution for an economic crystallization are avoided.Type: GrantFiled: September 30, 1976Date of Patent: December 20, 1977Inventors: George J. Hartman, Michael G. Darland
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Patent number: 3996334Abstract: An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a final leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing thereiType: GrantFiled: June 2, 1975Date of Patent: December 7, 1976Assignees: Southwire Company, National Steel Corporation, Earth Sciences, Inc.Inventors: George J. Hartman, Vernon R. Ewing