Patent US4691718A successfully refreshed from Google Patents.
US4691718A
Expired / Lapsed
US
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Toothbrush
Assignee: Sangi Co Ltd
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Filing: 1986-03-31
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Granted: 1987-09-08
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Expires: 2006-03-31
Abstract
Abstract A toothbrush includes a bristle portion having implanted bristles and molded from an ion eluting-type ceramic, a conductor extending into the interior of the bristle portion, and a battery to which the conductor is connected. An electric current flows from the user's hand toward the surface of the teeth through the user's body as the teeth are brushed, thereby causing calcium of fluorine ion, which elutes from the ceramic constituting the bristle portion, to be deposited onto and to penetrate the teeth and dental pulpa while tartar is removed from the surface of the teeth by electronic decomposition.
Inventors
- 👤 Shuji Sakuma
- 👤 Hirotaka Fujinawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:07
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/20; A61N1/30; A61N1/303
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A toothbrush comprising a bristle portion having bristles implanted therein, and a handle portion contiguous to said bristle portion, said bristle portion consisting of an ion eluting-type ceramic, said handle or bristle portion having a battery accommodated therein, a first conductor accommodated therein and connected to one pole of said battery, and a second conductor connected to the pole of said battery and fixedly secured to the surface of said handle, said iirst conductor extending into the interior of said bristle portion and exposing outward via at least one hole on said bristle portion.
Claim 2
Dependent Claim
94 words
A toothbrush comprising a bristle portion having bristles implanted therein, and a handle portion contiguous to said bristle portion, said bristle portion consisting of an ion eluting-type ceramic, said handle or bristle portion having a battery accommodated therein, a first conductor accommodated therein and connected to one pole of said battery, and a second conductor connected to the pole of said battery and fixedly secured to the surface of said handle, said iirst conductor extending into the interior of said bristle portion and exposing outward via at least one hole on said bristle portion.
Claim 3
Dependent Claim
18 words
The toothbrush according to claim 1, wherein said bristle portion comprises a molded body of an apatite ceramic.
Claim 4
Dependent Claim
22 words
The toothbrush according to claim 2, wherein said apatite ceramic is hydroxy apatite [Ca 10 (PO 4 ) 6 (OH) 2 ].
Claim 5
Dependent Claim
22 words
The toothbrush according to claim 2, wherein said apatite ceramic is apatite fluoride [Ca 10 (PO 4 ) 6 F 2 ].
Claim 6
Dependent Claim
32 words
The toothbrush according to claim 2, wherein said first conductor is connected to a negative pole of said battery and said second conductor is connected to a positive pole of said battery.
Claim 7
Dependent Claim
25 words
The toothbrush according to claim 5, wherein said handle portion comprises a synthetic resin material and said first conductor is insertable into said bristle portion.
Claim 8
Dependent Claim
23 words
The toothbrush according to claim 5, wherein said handle portion comprises an ion eluting-type ceramic and is integrally molded with said bristle portion.
References Cited (Backward Citations)
US2834344A
Cited
US3520297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |