Patent US4445860A successfully refreshed from Google Patents.
US4445860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rechargeable fluid driven dental tool
Assignee: Individual
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Filing: 1982-05-17
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Granted: 1984-05-01
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Expires: 2002-05-17
Abstract
Abstract A rechargeable fluid driven dental tool. A hand piece includes a hollow handle forming a container chargeable with a liquefied gas. A rotatable turbine mounted in the head of the tool is connected by means of a passage to the container of liquefied gas. A control valve extending into the passage controls the amount of gas flow to the turbine with a pressure relief valve limiting maximum liquid flow and allowing the liquefied gas to change to gas for driving the turbine.
Inventors
- 👤 John H. Oehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:35
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/02; A61C1/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A dental hand piece including self-contained energy source comprising: a main body with a hollow handle forming a rechargeable container to hold pressurized liquid, a head attached to said handle and a passage leading from said container to said head, said main body including an expansion chamber to allow said liquid from said container to expand to a gas; a turbine mounted in said head next to said passage to receive gas therefrom with means extending outwardly from said turbine to mountingly receive a dental tool; finger push lever means mounted to said main body and extendable into said passage to control the amount of fluid flow from said container to said turbine; and, externally operable needle valve means mounted to said main body and extending into said passage means controllably allowing liquid within said container to expand to a gas as said liquid flows into said passage.
Claim 2
Dependent Claim
148 words
A dental hand piece including self-contained energy source comprising: a main body with a hollow handle forming a rechargeable container to hold pressurized liquid, a head attached to said handle and a passage leading from said container to said head, said main body including an expansion chamber to allow said liquid from said container to expand to a gas; a turbine mounted in said head next to said passage to receive gas therefrom with means extending outwardly from said turbine to mountingly receive a dental tool; finger push lever means mounted to said main body and extendable into said passage to control the amount of fluid flow from said container to said turbine; and, externally operable needle valve means mounted to said main body and extending into said passage means controllably allowing liquid within said container to expand to a gas as said liquid flows into said passage.
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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |