US4704088A — Dental materials dispenser and applicator

Claim 1

Independent Claim 130 words

A disposable cartridge assembly for a dental instrumentality designed to effect ejection of a flowable material for dental use, comprising: a cartridge cylinder defining an elongate passage of uniform cross section; a piston, having a stem and a head. positioned in the passage at one end of the cylinder; the other end of the cylinder containig a discharge opening; the passage between the piston and the other end providing a chamber within which is received a charge of flowable material; a hollow applicator needle fixed at the other end in the discharge opening such that the interior of said needle is in communication with the interior of the passage in the cylinder; said piston head being movable in the passage to effect discharge of material therefrom and through the needle.

Claim 2

Dependent Claim 130 words

A disposable cartridge assembly for a dental instrumentality designed to effect ejection of a flowable material for dental use, comprising: a cartridge cylinder defining an elongate passage of uniform cross section; a piston, having a stem and a head. positioned in the passage at one end of the cylinder; the other end of the cylinder containig a discharge opening; the passage between the piston and the other end providing a chamber within which is received a charge of flowable material; a hollow applicator needle fixed at the other end in the discharge opening such that the interior of said needle is in communication with the interior of the passage in the cylinder; said piston head being movable in the passage to effect discharge of material therefrom and through the needle.

Claim 3

Dependent Claim 40 words

The cartridge assembly of claim 1 wherein the hollow needle is a slender hollow needle fixed at one end in the discharge opening and extending forwardly at an obtuse angle to the cartidge cylinder and radially away from the distributor.

Claim 4

Dependent Claim 33 words

The cartridge assembly of claim 2 further comprising an electrical conductor means externally exposed at one end of the cylinder and connected to a heating element at the other end of the cylinder.

Claim 5

Dependent Claim 56 words

The cartridge assembly of claim 2 further comprising a sleeve positioned within the passage and surrounding the stem of the piston and a washer positioned between said sleeve and the head of the piston so that movement of the sleeve toward the piston head causes the piston head to move while the washer seals the passage.

Claim 6

Dependent Claim 121 words

A dental material dispenser comprising: an elongate holder containing a change of material and having a hollow needle at one end through which material can be extruded and a piston at the other end for expelling the material; an actuator supported in the chamber in axial alignment with the piston; means for moving the actuator axially to cause the piston to push material from the elongate passage through the needle; a driving element coupled to said means for moving the actuator; a motor coupled to said driving element for producing the movement of said actuator; manually controlled switch means for operating said dispenser; and electronic controller means, responsive to said switch means, for controlling the speed and direction of said motor,

Claim 7

Dependent Claim 121 words

A dental material dispenser comprising: an elongate holder containing a change of material and having a hollow needle at one end through which material can be extruded and a piston at the other end for expelling the material; an actuator supported in the chamber in axial alignment with the piston; means for moving the actuator axially to cause the piston to push material from the elongate passage through the needle; a driving element coupled to said means for moving the actuator; a motor coupled to said driving element for producing the movement of said actuator; manually controlled switch means for operating said dispenser; and electronic controller means, responsive to said switch means, for controlling the speed and direction of said motor,

Claim 8

Dependent Claim 83 words

A dental extruder for effecting ejection of an extrudable material into a root canal comprising an elongate holder containing an axial chamber for receiving a cartridge wherein the cartridge contains a charge of the extrudable material and compromises a hollow needle at one end through which the material can be extruded, and a piston at the other end for expelling the material; means, supported in the chamber, for moving the piston to cause material to be expelled from the cartridge through the needle.

Claim 9

Dependent Claim 83 words

A dental extruder for effecting ejection of an extrudable material into a root canal comprising an elongate holder containing an axial chamber for receiving a cartridge wherein the cartridge contains a charge of the extrudable material and compromises a hollow needle at one end through which the material can be extruded, and a piston at the other end for expelling the material; means, supported in the chamber, for moving the piston to cause material to be expelled from the cartridge through the needle.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-11-02	1991-05-04	1991-11-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-11-02	1995-05-04	1995-11-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-11-02	1999-05-04	1999-11-03	$7700.00	Window Closed / Lapsed

Dental materials dispenser and applicator

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