Patents by Inventor Roger A. Rajewski

Roger A. Rajewski 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).

  • Patent number: 7744923
    Abstract: Commercially feasible methods for lyophobic precipitation of liquid-dispersed or dissolved material (e.g., medicaments) are provided wherein a plurality of individual, open containers (22) each containing a quantity (84) of a solution or dispersion are treated within a common pressurizable chamber (12). In this process, desired near-supercritical or supercritical temperature and pressure conditions are established for a selected antisolvent gas such as carbon dioxide, and an ultrasonic device (14) is actuated to generate high energy ultrasonic waves in the chamber (12). This leads to intense mixing of the antisolvent with the liquid solution or dispersion within the containers (22), with consequent solvent removal and material precipitation.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: June 29, 2010
    Assignee: Crititech, Inc.
    Inventors: Roger A. Rajewski, Bala Subramaniam, Fenghui Niu
  • Publication number: 20100056592
    Abstract: A prodrug that has a prodrug moiety that degrades into a compound having the general Formula I with R3 being an alcoholic moiety can be useful in therapies for neurodegenerative diseases as well as cancer. Accordingly, the prodrug compounds can have a structure of Formula I, analogs thereof, derivatives thereof, or salts thereof, wherein: A and B are sulfur or oxygen; R1 and R2, in para, meta, or ortho position, are independently halogen, alkyl, alkoxy, haloalkyl, where R1 and R2 independently are straight chain, branched, substituted or unsubstituted; and R3 is a prodrug moiety. As examples, the prodrug can have a structure of any of Formulas I-V, which as shown in the specification.
    Type: Application
    Filed: August 10, 2009
    Publication date: March 4, 2010
    Inventors: Roger A. Rajewski, Mehmet Tanol, Ingrid Gunda Georg, Michelle P. McIntosh
  • Publication number: 20100047343
    Abstract: A multi-particulate pharmaceutical composition of rapid release particles and controlled release particles comprising tramadol or a salt thereof is provided. The composition provides a rapid and controlled release of tramadol or a salt thereof in a substantially pH independent manner after oral administration to a subject. The composition can be included in a capsule, caplet, sachet, or other solid dosage form adapted to retain and then release solid pharmaceutical compositions.
    Type: Application
    Filed: October 29, 2009
    Publication date: February 25, 2010
    Applicant: The University of Kansas
    Inventors: John L. Haslam, Roger A. Rajewski
  • Publication number: 20100022635
    Abstract: The disclosure provides novel dosing regimens for Hsp90 inhibitors for use in the treatment or prevention of a neurodegenerative disorder, an autoimmune disorder, or cancer. The methods involve administering one or more doses of a therapeutically effective amount of at least one Hsp90 inhibitor to a subject in need thereof such that no more than a single dose is administered within a period of about 7 days.
    Type: Application
    Filed: July 28, 2009
    Publication date: January 28, 2010
    Applicant: University of Kansas
    Inventor: Roger A. Rajewski
  • Publication number: 20090197821
    Abstract: The present embodiment of the invention is generally directed to compositions comprising suspensions of poorly water-soluble compounds recrystallized in nanoparticulate sizes ranging from 0.1 to 5 ?m. In addition, the embodiment of the invention is directed to methods for preparation and administration of these compositions to a patient for prevention and treatment of disease states.
    Type: Application
    Filed: February 27, 2009
    Publication date: August 6, 2009
    Applicant: CRITITECH, INC.
    Inventors: Jeffrey M. Jonas, Roger A. Rajewski, Bala Subramaniam, Katherine F. Terranova
  • Publication number: 20090098209
    Abstract: The present invention is directed to methods of delivering propofol derivative compounds via pulmonary administration to a mammal in order to induce or maintain anesthetized, sedated and sub-hypnotic states.
    Type: Application
    Filed: October 14, 2008
    Publication date: April 16, 2009
    Applicant: UNIVERSITY OF KANSAS
    Inventors: Roger A. RAJEWSKI, Michelle P. McIntosh
  • Publication number: 20080248102
    Abstract: The present invention provides an orally dissolving capsule comprising pullulan, a plasticizer and a dissolution enhancing agent.
    Type: Application
    Filed: April 4, 2008
    Publication date: October 9, 2008
    Applicant: University of Kansas
    Inventors: Roger A. Rajewski, John L. Haslam
  • Publication number: 20080089944
    Abstract: Commercially feasible methods for lyophobic precipitation of liquid-dispersed or dissolved material (e.g., medicaments) are provided wherein a plurality of individual, open containers (22) each containing a quantity (84) of a solution or dispersion are treated within a common pressurizable chamber (12). In this process, desired near-supercritical or supercritical temperature and pressure conditions are established for a selected antisolvent gas such as carbon dioxide, and an ultrasonic device (14) is actuated to generate high energy ultrasonic waves in the chamber (12). This leads to intense mixing of the antisolvent with the liquid solution or dispersion within the containers (22), with consequent solvent removal and material precipitation.
    Type: Application
    Filed: October 11, 2007
    Publication date: April 17, 2008
    Applicant: CritiTech, Inc.
    Inventors: Roger A. Rajewski, Bala Subramaniam, Fenghui Niu
  • Patent number: 6562952
    Abstract: A process for forming small micron-sized (1-10 &mgr;m) protein particles is provided wherein a protein, a solvent system for the protein and an antisolvent for the protein solvent system are contacted under conditions to at least partially dissolve the protein solvent system in the antisolvent, thereby causing precipitation of the protein. The solvent system is made up of at least in part of a halogenated organic alcohol, most preferably 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP). Preferably, a solution of the protein in the solvent system is sprayed through a nozzle into a precipitation zone containing the antisolvent (preferably CO2) under near- or supercritical conditions.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: May 13, 2003
    Assignee: The University of Kansas
    Inventors: Roger A. Rajewski, Bala Subramaniam, William K. Snavely, Fenghui Niu
  • Publication number: 20030087837
    Abstract: The present embodiment of the invention is generally directed to compositions comprising suspensions of poorly water soluble compounds recrystallized in nanoparticulate sizes ranging from 0.1 to 5 &mgr;m. In addition, the embodiment of the invention is directed to methods for preparation and administration of these compositions to a patient for prevention and treatment of disease states. In particular, the embodiment of the invention is directed to compositions comprising suspensions of poorly water-soluble compounds, such as antimitotics and antibiotics, in nanoparticulates and methods of prevention and treatment of chronic disease states, such as cancer, by intraperitoneal and intravenous administration of such compositions.
    Type: Application
    Filed: October 15, 2002
    Publication date: May 8, 2003
    Inventors: Jeffrey M. Jonas, Roger A. Rajewski, Bala Subramaniam, Katherine Fern Terranova
  • Publication number: 20030055023
    Abstract: An injectable formulation of a sedative hypnotic drug, such as the anesthetic drug etomidate, that is pharmaceutically stable, demonstrates a reduced incidence of pain upon injection, and is bioequivalent with currently approved formulations. The formulation of the present invention employs a sulfoalkyl ether cyclodextrin solubilizing and complexing excipient, such as CAPTISOL® cyclodextrin (sulfobutyl ether &bgr;-cyclodextrin) to form a true aqueous solution. This formulation minimizes the allergic response and microbial contamination issues typically associated with parenteral emulsion formulations. The present formulation also reduces pain on injection as compared to the known organic solvent based formulations containing etomidate. The liquid formulation can be sterile filtered unlike emulsion-type formulations of sedative hypnotics. The liquid formulation can be lyophilized or otherwise dried to yield a solid formulation.
    Type: Application
    Filed: March 19, 2002
    Publication date: March 20, 2003
    Inventors: Roger A. Rajewski, Michelle P. McIntosh, Diane O. Thompson, Gerold L. Mosher
  • Patent number: 6113795
    Abstract: Processes and apparatuses are provided for continuously harvesting particles from organic solution-laden near-critical and supercritical fluids. Broadly, the processes and apparatuses utilize a filter or separator comprising a thin membrane supported on a sintered stainless steel tube. A feed stream comprising the desired particles, a supercritical antisolvent for the particles (preferably CO.sub.2), and a solvent for the particles, is contacted with the membrane layer of the filter under supercritical conditions for the mixture of antisolvent and solvent. The preferred antisolvents are substantially miscible with the solvent and have a critical temperature of less than 160.degree. C. The desired particles are retained by the filter while the solvent and most of the antisolvent pass through the filter, resulting in separation of the particles from the solvent.
    Type: Grant
    Filed: November 17, 1998
    Date of Patent: September 5, 2000
    Assignee: The University of Kansas
    Inventors: Bala Subramaniam, Roger A. Rajewski, David J. Bochniak
  • Patent number: 6046177
    Abstract: Sulfoalkyl ether cyclodextrin (SAE-CD) based controlled release pharmaceutical formulations are provided by the present invention. The present solid pharmaceutical formulations consist of a core comprising a physical mixture of one or more SAE-CD derivatives, an optional release rate modifier, a therapeutic agent, a major portion of which is not complexed to the SAE-CD, and an optional release rate modifying coating surrounding the core. The present formulations are advantageously easier to prepare than other SAE-CD based formulations in the art yet provide similar or improved effectiveness. The SAE-CD derivative is used to modify the bioavailability and/or rate of bioabsorption of therapeutic agents. Multi-layered, osmotic pump, coated, and uncoated tablet, minitablet, pellet, micropellet, particle, powder, and granule dosage forms are disclosed herein.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: April 4, 2000
    Assignee: Cydex, Inc.
    Inventors: Valentino J. Stella, Roger A. Rajewski, Venkatramana M. Rao, James W. McGinity, Gerold L. Mosher
  • Patent number: 5874029
    Abstract: A method and an apparatus useful for the production of microparticles and nanoparticles are disclosed in which a compressed fluid and a solution including a solvent and a solute are introduced into a nozzle to produce a mixture. The mixture is then passed out of the nozzle to produce a spray of atomized droplets. The atomized droplets are contacted with a supercritical antisolvent to cause depletion of the solvent in the droplets so that particles are produced from the solute. Preferably, these particles have an average diameter of 0.6 .mu.m or less. The invention can be used in the pharmaceutical, food, chemical, electronics, catalyst, polymer, pesticide, explosives, and coating industries, all of which have a need for small-diameter particles.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: February 23, 1999
    Assignee: The University of Kansas
    Inventors: Bala Subramaniam, Said Saim, Roger A. Rajewski, Valentino Stella
  • Patent number: 5874418
    Abstract: Sulfoalkyl ether-cyclodextrin (SAE-CD) based pharmaceutical formulations are provided by the present invention. These formulations comprise SAE-CD derivatives and a therapeutic agent, a major portion of which is not complexed to the SAE-CD. The present formulations are advantageously easier to prepare than other SAE-CD based formulations in the art yet provide similar or improved effectiveness. The SAE-CD derivative can be used to modify the bioavailability and/or rate of bioabsorption of therapeutic agents.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: February 23, 1999
    Assignee: Cydex, Inc.
    Inventors: Valentino Stella, Roger A. Rajewski, James W. McGinity
  • Patent number: 5833891
    Abstract: Improved methods and apparatus for particle precipitation and coating using near- or supercritical fluid conditions are described. A fluid dispersion having a continuous phase dispersant and at least one precipitatable substance therein is contacted with a supercritical fluid (SCF) antisolvent so as to generate focused high frequency antisolvent sonic waves, breaking up the dispersion into extremely small droplets; the enhanced mass transfer rates between the droplets and the antisolvent causes precipitation of very small particles on the order of 0.1-10 .mu.m. In coating processes, a turbulent fluidized flow of core particles is created using an SCF antisolvent in an enclosed zone. The core particles are contacted therein at near- or supercritical conditions by a fluid dispersion containing a dispersant together with a precipitatable substance. The antisolvent depletes the dispersant and the substance is precipitated onto the fluidized core particles.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: November 10, 1998
    Assignee: The University of Kansas
    Inventors: Bala Subramaniam, Said Saim, Roger A. Rajewski, Valentino Stella
  • Patent number: 5591731
    Abstract: The present invention relates to a sterile, stable vacuum dried crystalline amifostine composition and, optionally, pharmaceutically acceptable excipient(s). Typically, the crystalline compositions of the present invention exhibit enhanced stability at temperatures ranging from about 4.degree. C. to about ambient temperature for a period of at least 2 years relative to existing solid vacuum dried amorphous amifostine preparations. The reconstituted compositions of the present invention are suitable for administration to humans as a radio- or chemoprotecting agent.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: January 7, 1997
    Assignee: U.S. Bioscience, Inc.
    Inventors: Paul E. Kennedy, Roger A. Rajewski, John M. Baldoni
  • Patent number: 5424471
    Abstract: The present invention relates to a sterile, stable vacuum dried crystalline amifostine composition and, optionally, pharmaceutically acceptable excipient(s). Typically, the crystalline compositions of the present invention exhibit enhanced stability at temperatures ranging from about 4.degree. C. to about ambient temperature for a period of at least 2 years relative to existing solid vacuum dried amorphous amifostine preparations. The reconstituted compositions of the present invention are suitable for administration to humans as a radio- or chemoprotecting agent.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: June 13, 1995
    Assignee: U.S. Bioscience, Inc.
    Inventors: Paul E. Kennedy, Roger A. Rajewski, John M. Baldoni
  • Patent number: 5376645
    Abstract: Sulfoalkyl ether cyclodextrin derivatives and their use as solubilizing agents for water insoluble drugs for oral, intranasal, or parenteral administration are disclosed.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: December 27, 1994
    Assignee: University of Kansas
    Inventors: Valentino J. Stella, Roger Rajewski
  • Patent number: 5134127
    Abstract: Sulfoalkyl ether cyclodextrin derivatives and their use as solubilizing agents for water insoluble drugs for oral, intranasal, or parenteral administration are disclosed.
    Type: Grant
    Filed: January 23, 1990
    Date of Patent: July 28, 1992
    Assignee: University of Kansas
    Inventors: Valentino Stella, Roger Rajewski