US3827147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental tool
Assignee: Individual
•
Filing: 1972-05-22
•
Granted: 1974-08-06
•
Expires: 1992-05-22
Abstract
Abstract A dental tool is described for use in the impression process of dental prosthesis. The hand-held dental tool includes an impression material cartridge releasably connected to a cylindrical tool housing. A controlled amount of air pressure is directed from a source through a hose and into a bore of the cylindrical housing to force a freely movable piston against the rear end of an elongated plunger which has its forward end slidably mounted in the cartridge. The plunger, in turn, forces a flowable impression material along the interior of the cartridge to flow from a reduced opening.
Inventors
- 👤 J Condon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/00593; A; A61; A61C; A61C9/00; A61C9/0026; B05C17/00503; B05C17/00516
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
215 words
A dental tool for applying impression material onto a patient''s tooth; comprising a cylindrical cartridge having an open end and a reduced end with a reduced opening, in which the cartridge is filled with a flowable impression material; an elongated plunger having a forward end slidably mounted in the cartridge for pushing the impression material out the reduced opening and a rear end extending outward from the open end; a cylindrical housing having a bore with an open end for receiving the rear end of the plunger therein; said housing having a free piston slidably mounted in the bore for engaging the rear end of the plunger; an air line communicating with the bore behind the piston and connectable to a source of air pressure to force the free piston toward the open end to push the plunger and thereby dispense the impression material from the reduced end of the cartridge; a releasable connection means for operatively connecting the open end of the cartridge to the cylindrical housing; and a locking lever pivotally mounted to the cylindrical housing in which the lever has a projecting section extending forward of the housing terminating in a nose element for releasably gripping the reduced end of the cartridge when the cartridge is operatively connected to the cylindrical housing.
Claim 2
Dependent Claim
215 words
A dental tool for applying impression material onto a patient''s tooth; comprising a cylindrical cartridge having an open end and a reduced end with a reduced opening, in which the cartridge is filled with a flowable impression material; an elongated plunger having a forward end slidably mounted in the cartridge for pushing the impression material out the reduced opening and a rear end extending outward from the open end; a cylindrical housing having a bore with an open end for receiving the rear end of the plunger therein; said housing having a free piston slidably mounted in the bore for engaging the rear end of the plunger; an air line communicating with the bore behind the piston and connectable to a source of air pressure to force the free piston toward the open end to push the plunger and thereby dispense the impression material from the reduced end of the cartridge; a releasable connection means for operatively connecting the open end of the cartridge to the cylindrical housing; and a locking lever pivotally mounted to the cylindrical housing in which the lever has a projecting section extending forward of the housing terminating in a nose element for releasably gripping the reduced end of the cartridge when the cartridge is operatively connected to the cylindrical housing.
Claim 3
Dependent Claim
26 words
The dental tool as defined in claim 1 wherein the free piston has a diameter greater than the cross-section of the rear end of the plunger.
Claim 4
Dependent Claim
59 words
The dental tool as defined in claim 1 wherein the open end of the cartridge has a male connector element associated therewith and wherein the open end of the housing has a female connector element therewith for receiving a male connector element and for releasably interlocking with the male connector element to operatively connect the cartridge to the housing.
Claim 5
Dependent Claim
70 words
The dental tool as defined in claim 3 wherein the male connector element includes shoulder projections extending radially outward from the open end of cartridge and wherein the female connector element includes a recess for receiving the open end of the cartridge therein with corresponding shoulders for engaging the male connector shoulders when the open end of the cartridge is inserted into the pocket and rotated relative to the housing.
Claim 6
Dependent Claim
24 words
The dental tool as defined in claim 1 wherein the locking means includes a handle section for extending alongside the exterior of the housing.
Claim 7
Dependent Claim
45 words
The dental tool as defined in claim 1 wherein the housing has an air passageway communicating with the air line and extending to the reduced end of the cartridge for directing air into the patient''s mouth to keep the tooth receiving the impression material dry.
Claim 8
Dependent Claim
26 words
The dental tool as defined in claim 1 further comprising a safety valve means for preventing the inadvertent application of air pressure to the free piston.
References Cited (Backward Citations)
US3521356A
Cited
US3641673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |