Patent US4786251A successfully refreshed from Google Patents.
US4786251A
Expired / Lapsed
US
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Dental handpiece and high speed turbine assembly
Assignee: Individual
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Filing: 1986-10-10
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Granted: 1988-11-22
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Expires: 2006-10-10
Abstract
Abstract A dental handpiece which includes a high speed compressed-air driven turbine at the distal end thereof which serves to drive a dental drill, or other element. The handpiece includes an internal conduit for supplying compressed air to the turbine and an exit port for exhausting the compressed air. In accordance with the concepts of the invention, the exit port is coupled to a vacuum pump, or other vacuum source, to enhance the turbine efficiency and to provide for increased power output with significant noise suppression, and also to facilitate the use of in-line oil mist lubrication.
Inventors
- 👤 Neil C. Ruegsegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:09
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/02; A61C1/05; Y; Y10; Y10S; Y10S415/00; Y10S415/904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A dental handpiece comprising: an elongated tubular body; a turbine housing mounted at one end of said tubular body and having an entrance port and an exit port; a rotor rotatably mounted in said housing having a plurality of vanes; means for mounting a dental element on said rotor in coaxial relationship therewith; a source of compressed air; conduit means within said housing; means coupling said conduit means to said source for causing said conduit means to supply compressed air through said entrance port to said vanes to cause said rotor to rotate and impart a driving torque to said dental element; a vacuum pressure source; and means coupling said exit port to said vacuum pressure source for establishing a vacuum pressure at said exit port so as to increase the torque imparted by said compressed air to said dental element.
Claim 2
Dependent Claim
141 words
A dental handpiece comprising: an elongated tubular body; a turbine housing mounted at one end of said tubular body and having an entrance port and an exit port; a rotor rotatably mounted in said housing having a plurality of vanes; means for mounting a dental element on said rotor in coaxial relationship therewith; a source of compressed air; conduit means within said housing; means coupling said conduit means to said source for causing said conduit means to supply compressed air through said entrance port to said vanes to cause said rotor to rotate and impart a driving torque to said dental element; a vacuum pressure source; and means coupling said exit port to said vacuum pressure source for establishing a vacuum pressure at said exit port so as to increase the torque imparted by said compressed air to said dental element.
Claim 3
Dependent Claim
33 words
The dental handpiece defined in claim 1, and which includes a hose extending to the other end of said tubular body to couple said conduit means to said source of said compressed air.
Claim 4
Dependent Claim
21 words
The dental handpiece defined in claim 1, and which includes a hose coupling said exit port to said vacuum pressure source.
Claim 5
Dependent Claim
21 words
The dental handpiece defined in claim 1, in which said compressed air is pressurized in the range of substantially 15-30 psi.
Claim 6
Dependent Claim
26 words
The dental handpiece defined in claim 1, in which the vacuum pressure of said vacuum pressure source is of the order of -20 millimeters of mercury.
References Cited (Backward Citations)
US1151965A
Cited
US2340787A
Cited
US2455460A
Cited
US3132426A
Cited
US3364576A
Cited
US3092908A
Cited
US3101541A
Cited
US3077333A
Cited
US3189999A
Cited
US3248792A
Cited
US3477636A
Cited
US4249896A
Cited
US4253831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |