Patents by Inventor Ajit Karmaker

Ajit Karmaker 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: 6345984
    Abstract: Ready-to-use preshaped, prefabricated cured structural components are prepared in a variety of shapes and sizes to be used in the fabrication of dental appliances. Preferably the structural components are fabricated of a fiber-reinforced composite material or a particulate-filled composite material comprising fibers or particulate filler impregnated with a polymeric matrix. The polymeric matrix is partially or fully cured to the point of sufficient hardness to provide a ready-to-use structural component for use in the fabrication of dental appliances such as orthodontic retainers, bridges, space maintainers, tooth replacement appliances, splints, crowns, partial crowns, dentures, posts, teeth, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, cylinders, and connectors.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: February 12, 2002
    Assignee: Jeneric/Pentron, Inc.
    Inventors: Ajit Karmaker, Martin L. Schulman, Arun Prasad
  • Publication number: 20010036617
    Abstract: Ready-to-use preshaped, prefabricated cured structural components are prepared in a variety of shapes and sizes to be used in the fabrication of dental appliances. Preferably the structural components are fabricated of a fiber-reinforced composite material or a particulate-filled composite material comprising fibers or particulate filler impregnated with a polymeric matrix. The polymeric matrix is partially or fully cured to the point of sufficient hardness to provide a ready-to-use structural component for use in the fabrication of dental appliances such as orthodontic retainers, bridges, space maintainers, tooth replacement appliances, splints, crowns, partial crowns, dentures, posts, teeth, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, cylinders, and connectors.
    Type: Application
    Filed: June 25, 1999
    Publication date: November 1, 2001
    Applicant: ANN M. KNAB
    Inventors: AJIT KARMAKER, MARTIN L. SCHULMAN, ARUN PRASAD
  • Patent number: 6200136
    Abstract: The present invention relates to unique dental structures such as bridges and crowns. The bridge comprises a structural component such as a fiber reinforced polymeric base material impregnated bar disposed within interproximal cavities located in the distal occlusal surface of the mesial abutment tooth and the mesial occlusal surface of the distal abutment tooth, and a support element of woven fibers and polymeric base material. The support element can span the endentulous area, wrap around the structural component, and provide support for the veneer on the pontic.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: March 13, 2001
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Arun Prasad, Ajit Karmaker, Elie Zammarieh
  • Patent number: 6186790
    Abstract: Ready-to-use preshaped, prefabricated cured structural components are prepared in a variety of shapes and sizes to be used in the fabrication of dental appliances. Preferably the structural components are fabricated of a fiber-reinforced composite material comprising fibers impregnated with a polymeric matrix. The polymeric matrix is partially or fully cured to the point of sufficient hardness to provide a ready-to-use structural component for use in the fabrication of dental appliances such as orthodontic retainers, bridges, space maintainers, tooth replacement appliances, splints, crowns, partial crowns, dentures, posts, teeth, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, cylinders, and connectors.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: February 13, 2001
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Ajit Karmaker, Martin L. Schulman, Arun Prasad
  • Patent number: 6186791
    Abstract: A dental post comprising a rod fabricated of fiber-reinforced composite material. The rod comprises a plurality of frustoconical sections arranged coaxially along the longitudinal axis of the rod. Preferably the rod has consistent width along the longitudinal axis wherein the frustoconical sections each have the same tapered width and same length. The number of frustoconical units per rod can vary. The frustoconical sections may vary in shape. Moreover, the rod may include a channel therein extending along the longitudinal axis thereof. The rod may also include one or more grooves extending along the surface thereof.
    Type: Grant
    Filed: March 29, 1999
    Date of Patent: February 13, 2001
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Ajit Karmaker, Arun Prasad
  • Patent number: 6132215
    Abstract: A hybrid fiber-reinforced structural component for dental restorations, wherein the hybrid reinforcing fibers comprise a core having a composite sheath bonded thereto. Preferably, the core comprises a material having a high modulus, such as tungsten, tantalum, niobium, boron or carbon. The composite sheath comprises fibers disposed within a polymeric matrix material, preferably the fibers glass or polyethylene fibers. The hybrid fiber-reinforced composite is particularly useful as a structural component for bridges or for reinforcement of a tooth restoration after endodontic treatment.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: October 17, 2000
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Arun Prasad, Ajit Karmaker
  • Patent number: 6039569
    Abstract: The present invention relates to unique dental structures such as bridges and crowns. The bridge comprises a structural component such as a fiber reinforced polymeric matrix bar disposed within interproximal cavities located in the distal occlusal surface of the mesial abutment tooth and the mesial occlusal surface of the distal abutment tooth. A structural wrap and/or occlusal strip comprising fibers embedded within a polymeric matrix can also be employed where the wrap is attached to one or both abutment teeth and one or both sides of the structural component. The occlusal strip is attached to the occlusal surface of both of the abutment teeth, spans the edentulous area, and is attached to the top surface of the structural component. Meanwhile, the crown comprises a wrap disposed around and adhered to a damaged natural tooth and may have an occlusal strip adhered to the occlusal surface of the natural tooth where the wrap is disposed around the edge of the occlusal strip.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: March 21, 2000
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Arun Prasad, Ajit Karmaker, Elie Zammarieh, Grant P. Day
  • Patent number: 6030220
    Abstract: A fiber-reinforced composite material for use in dental restorations such as dental bridges, splints, veneers, and laminates, wherein the composite material comprises a glass fiber material which has been heat treated at a temperature less than or equal to the annealing temperature of the glass for a length of time effective to prevent separation and fraying of the edges of the material upon cutting. The heat treatment therefore greatly enhances the ease of preparation of the dental restorations.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: February 29, 2000
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Ajit Karmaker, Arun Prasad
  • Patent number: 5921778
    Abstract: A reinforced composite material for use in dental restorations such as dental bridges, splints, veneers, and laminate comprising a hybrid woven material formed of glass yarns and synthetic yarns. Suitable synthetic yarns comprise polyethylene, polypropylene, polyester, acrylic fibers, or a combination thereof. The hybrid woven material of the present invention does not fray upon cutting, which greatly enhances ease of preparation of the fiber-reinforced dental restorations.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: July 13, 1999
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Ajit Karmaker, Arun Prasad