Patent US4138816A successfully refreshed from Google Patents.
US4138816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined amalgam carrier and dental handpiece
Assignee: Grace Development Co
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Filing: 1976-03-18
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Granted: 1979-02-13
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Expires: 1996-03-18
Abstract
Abstract A dental handpiece comprising a power source, plugger means, and a disposable cartridge assembly removably engagable with the power source, said plugger means being carried by the power source and selectively movable with respect to the cartridge for passing therethrough in a reciprocal movement, said cartridge including a housing preloaded with selected quantities of mercury and silver, or the like, in separate sealed compartments, and means extending through the housing and engagable with the power source for longitudinal and rotatable movement with respect to the housing, said longitudinal movement causing a combining of the initially separated mercury and silver components, said rotatable movement causing both mixing of the components to produce amalgam for denture fillings and discharging of said amalgam from the housing for engagement thereof by the plugger means, and said plugger means being selectively reciprocal through the cartridge for implanting multiple charges of the amalgam in a tooth cavity, or the like, and packing the charges in the cavity.
Inventors
- 👤 Fuller Warden
- 👤 Eugene W. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:52
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/00593; A; A61; A61C; A61C5/00; A61C5/60; A61C5/62
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
Cartridge means comprising a housing, mixing means disposed within said housing, sealing means carried by said mixing means and selectively engagable with a portion of said housing to provide at least two sealed chambers therein for storing quantities of ingredients preloaded therein, said mixing means operable for selectively combining and mixing said ingredients to produce an amalgam, a transverse passageway provided on the housing and being in selective communication with one of said chambers for receiving portions of the mixed ingredients therefrom.
Claim 2
Dependent Claim
82 words
Cartridge means comprising a housing, mixing means disposed within said housing, sealing means carried by said mixing means and selectively engagable with a portion of said housing to provide at least two sealed chambers therein for storing quantities of ingredients preloaded therein, said mixing means operable for selectively combining and mixing said ingredients to produce an amalgam, a transverse passageway provided on the housing and being in selective communication with one of said chambers for receiving portions of the mixed ingredients therefrom.
Claim 3
Dependent Claim
13 words
Cartridge means as set forth in claim 1 constructed of a plastic material.
Claim 4
Dependent Claim
97 words
Amalgam cartridge means preloaded with at least two ingredients in separate sealed compartments, transverse passageway means provided in said cartridge means and in communication with at least one of said compartments, mixing means provided in said cartridge means, said mixing means being selectively movable within said cartridge means for release of the two ingredients from the respective sealed compartments and rotatable to combine and mix the two ingredients to produce a mixture thereof and for ejecting said mixture into said passageway means, and wherein seal means is carried by said mixing means for providing said sealed compartments.
Claim 5
Dependent Claim
97 words
Amalgam cartridge means preloaded with at least two ingredients in separate sealed compartments, transverse passageway means provided in said cartridge means and in communication with at least one of said compartments, mixing means provided in said cartridge means, said mixing means being selectively movable within said cartridge means for release of the two ingredients from the respective sealed compartments and rotatable to combine and mix the two ingredients to produce a mixture thereof and for ejecting said mixture into said passageway means, and wherein seal means is carried by said mixing means for providing said sealed compartments.
Claim 6
Dependent Claim
104 words
Amalgam cartridge means preloaded with at least two ingredients in separate sealed compartments, transverse passageway means provided in said cartridge means and in communication with at least one of said compartments, mixing means provided in said cartridge means, said mixing means being selectively movable within said cartridge means for release of the two ingredients from the respective sealed compartments and rotatable to combine and mix the two ingredients to produce a mixture thereof and for ejecting said mixture into said passageway means, and including stub shaft means extending into one of said compartments and cooperating with said mixing means for facilitating said mixing operation.
Claim 7
Dependent Claim
104 words
Amalgam cartridge means preloaded with at least two ingredients in separate sealed compartments, transverse passageway means provided in said cartridge means and in communication with at least one of said compartments, mixing means provided in said cartridge means, said mixing means being selectively movable within said cartridge means for release of the two ingredients from the respective sealed compartments and rotatable to combine and mix the two ingredients to produce a mixture thereof and for ejecting said mixture into said passageway means, and including stub shaft means extending into one of said compartments and cooperating with said mixing means for facilitating said mixing operation.
Claim 8
Dependent Claim
126 words
Disposable amalgam cartridge means comprising a housing, one end of said housing being closed by a wall having a port therein, a rotatable shaft extending into the opposite end of the housing, a pair of spaced flanges mounted on said shaft for selective engagement with spaced apart portions of the inner surfaces of the housing, spiral mixing means connected to one end of said rotatable shaft and disposed within said housing, the opposite end of said rotatable shaft extending away from said housing for connection to suitable driving means, a transverse passageway connected to the closed wall of the housing and communicating with said port on said wall, and including longitudinally extending stub shaft means provided in said housing for cooperating with said spiral mixing means.
Claim 9
Dependent Claim
126 words
Disposable amalgam cartridge means comprising a housing, one end of said housing being closed by a wall having a port therein, a rotatable shaft extending into the opposite end of the housing, a pair of spaced flanges mounted on said shaft for selective engagement with spaced apart portions of the inner surfaces of the housing, spiral mixing means connected to one end of said rotatable shaft and disposed within said housing, the opposite end of said rotatable shaft extending away from said housing for connection to suitable driving means, a transverse passageway connected to the closed wall of the housing and communicating with said port on said wall, and including longitudinally extending stub shaft means provided in said housing for cooperating with said spiral mixing means.
Claim 10
Dependent Claim
24 words
Disposable cartridge means as set forth in claim 5 wherein said rotatable shaft is flexible and the transverse passageway has a longitudinally arcuate configuration.
Claim 11
Dependent Claim
195 words
Disposable amalgam cartridge means comprising a first housing, one end of said housing being closed by a wall having a port therein, the opposite end of the housing being open, a second housing having an open end disposed in contact with the open end of the first housing and secured thereto, the opposite end of said second housing having a reduced inner diameter for receiving a rotatable shaft, said rotatable shaft extending through said reduced diameter end, a pair of spaced apart flanges mounted on said shaft, one of said flanges in selective engagement with the inner periphery of said second housing and the other of said flanges in selective engagement with the reduced diameter portion of said second housing, spiral mixing means connected to one end of the rotatable shaft and disposed within the first housing, the other end of said shaft extending away from said second housing for connection to suitable drive means, a tubular transverse passageway connected to the closed wall of the first housing and communicating with the port in said wall, and including longitudinally extending stub shaft means provided in said first housing for cooperating with said spiral mixing means.
Claim 12
Dependent Claim
195 words
Disposable amalgam cartridge means comprising a first housing, one end of said housing being closed by a wall having a port therein, the opposite end of the housing being open, a second housing having an open end disposed in contact with the open end of the first housing and secured thereto, the opposite end of said second housing having a reduced inner diameter for receiving a rotatable shaft, said rotatable shaft extending through said reduced diameter end, a pair of spaced apart flanges mounted on said shaft, one of said flanges in selective engagement with the inner periphery of said second housing and the other of said flanges in selective engagement with the reduced diameter portion of said second housing, spiral mixing means connected to one end of the rotatable shaft and disposed within the first housing, the other end of said shaft extending away from said second housing for connection to suitable drive means, a tubular transverse passageway connected to the closed wall of the first housing and communicating with the port in said wall, and including longitudinally extending stub shaft means provided in said first housing for cooperating with said spiral mixing means.
Claim 13
Dependent Claim
24 words
Disposable cartridge means as set forth in claim 7 wherein the rotatable shaft is flexible and the transverse passageway has a longitudinally arcuate configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |