US3746033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intra-oral evacuator system
Assignee: Dentsply Sirona Inc
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Filing: 1971-08-05
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Granted: 1973-07-17
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Expires: 1991-08-05
Abstract
Abstract A dental oral evacuating system which includes a receptacle unit through which liquid and solid waste material passes after withdrawal from the oral cavity and means to connect the receptable to a source of flushing liquid for said receptacle. The system is connectable to a source of vacuum to effect such withdrawal of waste and a pressure-actuated switch in series with an electro-magnetically actuated valve, which controls the flow of flushing liquid to the receptacle, shutting off such flow unless the negative pressure in the receptacle is greater than a predetermined minimum amount to insure the delivery of flushing water only when suction is available to withdraw it from said receptacle.
Inventors
- 👤 A Keiper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:25
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/06; A61C17/065; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3109
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A compact dental oral evacuating unit Comprising a receptacle having a top, inlet means thereon communicating with the interior thereof and connectable to a source of vacuum, means on said top to which the discharge end of an oral evacuating conduit is connectable, inlet means on said top connected by a conduit to a source of water under pressure, a flow control valve in said conduit, pressure-actuated means interconnected to and communicating with the interior of said receptacle and responsive to the pressure therein, and means connecting said pressureactuated means to said flow control valve to operate the same between open and closed positions, said flow control valve being normally closed but said pressure-actuated means being responsive to negative pressure until a predetermined value of such negative pressure occurs within said receptacle and then causes said pressure-actuated means to open said valve and permit water to flow into said receptacle to flush the same.
Claim 2
Dependent Claim
154 words
A compact dental oral evacuating unit Comprising a receptacle having a top, inlet means thereon communicating with the interior thereof and connectable to a source of vacuum, means on said top to which the discharge end of an oral evacuating conduit is connectable, inlet means on said top connected by a conduit to a source of water under pressure, a flow control valve in said conduit, pressure-actuated means interconnected to and communicating with the interior of said receptacle and responsive to the pressure therein, and means connecting said pressureactuated means to said flow control valve to operate the same between open and closed positions, said flow control valve being normally closed but said pressure-actuated means being responsive to negative pressure until a predetermined value of such negative pressure occurs within said receptacle and then causes said pressure-actuated means to open said valve and permit water to flow into said receptacle to flush the same.
Claim 3
Dependent Claim
53 words
The dental unit according to claim 1 in which said top for said receptacle comprises a manifold detachably supporting a container dependingly therefrom, said top having ports therethrough communicating respectively with said means which are connectable to sources of vacuum and water and said means to which an oral evacuating conduit is connectable.
Claim 4
Dependent Claim
83 words
The dental unit according to claim 1 in which said receptacle is operated in a substantially vertical position and said means on said receptacle by which a source of vacuum is connected to said receptacle comprises a conduit extending into said receptacle from the top thereof to a depth appreciably below the inlet for water on said receptacle, and filter means surrounding the lower inlet end of said conduit to prevent particles larger than a predetermined size from being discharged from said receptacle.
Claim 5
Dependent Claim
41 words
The dental unit according to claim 1 in which said flow control valve is solenoid-operated and said pressure actuated means is a vacuum-responsive switch connected in an electrical circuit in series with said control valve and a source of electrical current.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |