US4993948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Applicator for dental material
Assignee: CFI Inc
•
Filing: 1989-10-30
•
Granted: 1991-02-19
•
Expires: 2009-10-30
Abstract
Abstract For free-hand use by a dentist, there is provided a cylinder containing tooth filling material urged out of the cylinder by spring pressure, sometimes augmented by thumb pressure against the end of a piston rod in the cylinder. Flow of the material out of the cylinder through a removable and replaceable flexible curved nozzle is under control of a valve located to be readily manipulated between open and closed positions by the same hand of the dentist. Preferably the filling material is in a discrete capsule containing enough filling material for several teeth and easily placed in and removed from the cylinder.
Inventors
- 👤 Frederick J. Cameron
- 👤 Carl L. Cranke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:45
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/00593; A; A61; A61C; A61C5/00; A61C5/60; A61C5/62; B05C17/00503; B05C17/00506
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
An applicator for dental material comprising: a. a cylindrical body adapted to receive a semi-fluid charge; b. a nozzle on one end of said cylindrical body and communicating therewith; c. a piston plunger reciprocable in said cylindrical body for displacing said charge from said cylindrical body to flow through said nozzle; d. a spring; e. means for mounting said spring in said body for engagement with said piston plunger; f. a removable cap mounted on the other end of said body and engageable with said spring for holding said spring in an initially compressed state to displace said piston plunger toward said nozzle; g. a flow controlling valve in said body between said piston plunger and said nozzle and movable between one position allowing said flow and another position blocking said flow; and, h. means connected to said valve and disposed outside said nozzle in position to be operated by a person holding said cylindrical body for moving said valve between said one position and said other position.
Claim 2
Dependent Claim
168 words
An applicator for dental material comprising: a. a cylindrical body adapted to receive a semi-fluid charge; b. a nozzle on one end of said cylindrical body and communicating therewith; c. a piston plunger reciprocable in said cylindrical body for displacing said charge from said cylindrical body to flow through said nozzle; d. a spring; e. means for mounting said spring in said body for engagement with said piston plunger; f. a removable cap mounted on the other end of said body and engageable with said spring for holding said spring in an initially compressed state to displace said piston plunger toward said nozzle; g. a flow controlling valve in said body between said piston plunger and said nozzle and movable between one position allowing said flow and another position blocking said flow; and, h. means connected to said valve and disposed outside said nozzle in position to be operated by a person holding said cylindrical body for moving said valve between said one position and said other position.
Claim 3
Dependent Claim
15 words
A device as in claim 1 in which said valve is a rotary plug valve.
Claim 4
Dependent Claim
57 words
A device as in claim 1 in which said cylindrical body has a body axis and said valve includes a plug shiftable between an open position and a closed position by the same hand of a person holding said cylindrical body at a location axially adjacent to said valve and separated from said nozzle by said valve.
Claim 5
Dependent Claim
40 words
A device as in claim 1 in which means defining indicia are on one end of said piston plunger and adjacent the end of said cylindrical body to indicate the relative position of said piston plunger and said cylindrical body.
Claim 6
Dependent Claim
50 words
A device as in claim 1 in which the direction of movement of said valve is substantially at right angles to the direction of material flow, and said valve includes a reduced portion aligned with the flow in said one position and removed from the flow in said other position.
References Cited (Backward Citations)
US3293749A
Cited
US3417971A
Cited
US3757981A
Cited
US3747812A
Cited
US4159570A
Cited
EP0032826A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |