Patent US4568283A successfully refreshed from Google Patents.
US4568283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical handpiece
Assignee: J Morita Manufaturing Corp
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Filing: 1984-12-06
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Granted: 1986-02-04
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Expires: 2004-12-06
Abstract
Abstract A handpiece for medical treatment having a brushless micromotor mounted in a handpiece casing for driving a cutting tool and having a coolant passageway formed on the outer periphery of a cylindrical yoke fixed to the frame of the handpiece body. In this handpiece, the coolant passageway is formed helically around the axis of the yoke from one end to the other end of the yoke. The sectional area of the yoke in any given longitudinal sectional position along the axis of the yoke is rendered approximately equal to prevent a reduction in motor torque and also enlargement of the handpiece in diameter.
Inventors
- 👤 Toshihiro Hotta
- 👤 Imazatol Minoru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/02; A61C1/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A medical handpiece having a brushless micromotor incorporated in a body of the handpiece and having a coolant passageway formed on the outer periphery of a cylindrical yoke fixed to the frame of the handpiece body, said handpiece being characterized in that said coolant passageway is formed so as to extend helically around the axis of the yoke from one end to the other end of the yoke.
Claim 2
Dependent Claim
68 words
A medical handpiece having a brushless micromotor incorporated in a body of the handpiece and having a coolant passageway formed on the outer periphery of a cylindrical yoke fixed to the frame of the handpiece body, said handpiece being characterized in that said coolant passageway is formed so as to extend helically around the axis of the yoke from one end to the other end of the yoke.
Claim 3
Dependent Claim
34 words
A medical handpiece according to claim 1, wherein said coolant passageway comprises a helical groove having an integral number of times more turns extending from one end to the other end of the yoke.
Claim 4
Dependent Claim
16 words
A medical handpiece according to claim 1 or 2, wherein said handpiece is a dental handpiece.
Claim 5
Dependent Claim
19 words
A medical handpiece according to claim 1 or 2, wherein a coolant pipe is placed in said coolant passageway.
Claim 6
Dependent Claim
14 words
A medical handpiece according to claim 4, wherein said handpiece is a dental handpiece.
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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |