Patent US2403562A successfully refreshed from Google Patents.
US5295833A
Expired / Lapsed
US
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Dental root canal diagnostic and treating equipment
Assignee: J Morita Manufaturing Corp
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Filing: 1992-09-29
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Granted: 1994-03-22
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Expires: 2012-09-29
Abstract
Abstract A dental root canal diagnostic and treating equipment with which specific position/s, which serve/s as the reference positions, can be set arbitrarily and such positions can be displayed. With the equipment, therefore, operation can be proceeded with knowledge of not only the position of the tip of the root canal instrument, which also serves as the measuring electrode, but also the remaining distance to the reference position.
Inventors
- 👤 Kobayashi Chihiro
- 👤 Kazunari Matoba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/04; A61C19/041; A61C19/042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A dental root canal diagnostic and treating equipment having a function to measure a root canal length, comprising: a setting means for setting arbitrarily specific positions which serve as preset reference positions in the treatment of root canal, and a display means for displaying the preset reference positions during diagnosis and treatment of a root canal.
Claim 2
Dependent Claim
56 words
A dental root canal diagnostic and treating equipment having a function to measure a root canal length, comprising: a setting means for setting arbitrarily specific positions which serve as preset reference positions in the treatment of root canal, and a display means for displaying the preset reference positions during diagnosis and treatment of a root canal.
Claim 3
Dependent Claim
35 words
A dental root canal diagnostic and treating equipment according to claim 1, wherein said preset reference positions are at least one of the group consisting of working length position, apical position and output changing position.
Claim 4
Dependent Claim
27 words
A dental root canal diagnostic and treating equipment according to claim 1 or 2, wherein said setting means is a stepless variable element using a variable resistor.
Claim 5
Dependent Claim
70 words
A dental root canal diagnostic and treating equipment according to claim 1 or 2, wherein said display means is made for displaying either or both of visual mode and auditory mode and said display means is constituted such that the display mode is different before or after the tip of a measuring electrode or a root canal instrument which also serves as a measuring electrode reaches said preset reference positions.
Claim 6
Dependent Claim
76 words
A dental root canal diagnostic and treating equipment according to claim 1 or 2, wherein said diagnostic and treating equipment is a root canal treating equipment of the ultrasonic type and it is so arranged that the output of the ultrasonic root canal treating equipment is automatically stopped or reduced upon arrival of the tip of the root canal instrument, which also serves as the measuring electrode, at a pre-selected one of said preset reference positions.
Claim 7
Dependent Claim
27 words
A dental root canal diagnostic and treating equipment according to claim 1 or 2, wherein said setting means comprises a stepwise variable element using a changeover switch.
Claim 8
Dependent Claim
38 words
A dental root canal diagnostic and treating equipment according to claim 1 wherein said display means further displays a position of a tip of a measuring electrode or a root canal instrument which serves as the measuring electrode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |