US4347233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental caries detection
Assignee: Kuraray Co Ltd
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Filing: 1979-11-29
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Granted: 1982-08-31
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Expires: 1999-11-29
Abstract
Abstract A caries detector, comprising a solution of a dye selected from the group consisting of Phloxine B (CI 45410), Phloxine BK (the corresponding dipotassium salt of CI 45410), Acid Red (CI 45100), Fast Acid Magenta (CI 17200), Fast Green FCF (CI 42053) and Rhodamine B (CI 45170) in a solvent.
Inventors
- 👤 Junichi Yamauchi
- 👤 Kyoichiro Shibatani
- 👤 Eiji Ikeguchi
- 👤 Ikuo Omura
- 👤 Yoshinori Nagase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:13
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K49/00; A61K49/001; A61K49/006; A61K8/00; A61K8/18; A61K8/30; A61K8/46; A61K8/466; A61K8/49; A61K8/4973; A61K8/498; A61K2800/00; A61K2800/40; A61K2800/42; A61K2800/43
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A method for distinguishing, by observation with visible light, between the carious portion and the sound portion of a decaying tooth by selectively dyeing the carious portion, which comprises applying a solution of Acid Red (CI 45100) in a concentration of from 0.1 to 5.0% by weight in a solvent which comprises at least 60% by weight of a mono-, di- or tri-hydroxy compound containing 2 to 20 carbon atoms to a decayed tooth to selectively dye the carious portion of the tooth, and then within 10 seconds after applying the solution washing away the remaining solution before the sound portion of the tooth is dyed with said solution.
Claim 2
Independent Claim
109 words
A method for distinguishing, by observation with visible light, between the carious portion and the sound portion of a decaying tooth by selectively dyeing the carious portion, which comprises applying a solution of Acid Red (CI 45100) in a concentration of from 0.1 to 5.0% by weight in a solvent which comprises at least 60% by weight of a mono-, di- or tri-hydroxy compound containing 2 to 20 carbon atoms to a decayed tooth to selectively dye the carious portion of the tooth, and then within 10 seconds after applying the solution washing away the remaining solution before the sound portion of the tooth is dyed with said solution.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein said solvent comprises at least 80% by weight of the mono-, di- or tri-hydroxy compound containing 2 to 10 carbon atoms.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein said solvent is triethylene glycol or propylene glycol.
References Cited (Backward Citations)
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JPS5138429A
Cited
JPS5138427A
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JPS5138428A
Cited
FR2347037A1
Cited
GB1560757A
Cited
US4204978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |