Resources Contact Us Home
Conically walled syringe providing a progressively tighter piston fit

Image Number 2 for United States Patent #3955719.

A syringe, such as used in dentistry to inject dental products, e.g. injection masses as so-called composites, cements, medicated pastes and the like into cavities. The syringe comprises a hollow cylinder, a piston axially movable in the cylinder, and a reservoir for the product to be injected. The piston fits into the reservoir which has at its front end a nozzle projecting out of the cylinder and at its back end an opening to receive the piston. At its front end the cylinder has a reduced inside diameter, so as to provide an abutment for the reservoir. The piston is removable from the cylinder so as to permit insertion of the piston into the back end of the reservoir, whereupon the piston with the reservoir attached to it can be inserted into the back end of the cylinder. Pressure on the piston forces the piston into the reservoir, so as to press the injection mass out of the nozzle of the reservoir. The use of a transparent material for the cylinder and the reservoir permits easy observation of the contents of the reservoir.

  Recently Added Patents
Protective vest
Sterilizable film for aseptic packaging
Radio communication system, base station apparatus, terminal apparatus, and radio communication method for radio communication system
Transferring storage devices within storage device testing systems
Sending notification of event
Light irradiation element, image forming structure, and image forming apparatus
Expression of dirigent gene EG261 and its orthologs and paralogs enhances pathogen resistance in plants
  Randomly Featured Patents
Procedure for RFID tagging of reusable plastic containers (RPCs)
Portable air conditioner
Apparatus, methods and articles of manufacture for a dual mode amplifier
Process for isomerization of alkylaromatics
High strength bag for storing materials in sterile condition
Pre-slit injection site and tapered cannula
Metal gasket
Brake actuators
Semiconductor memory device for dynamically storing data with channel body of transistor used as storage node
Sampling clock phase correction circuit of video signal