Patent US4571768A successfully refreshed from Google Patents.
US4571768A
Expired / Lapsed
US
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Toothbrush
Assignee: Tochigi Seiko Co Ltd
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Filing: 1984-08-14
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Granted: 1986-02-25
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Expires: 2004-08-14
Abstract
Abstract A toothbrush having a plurality of bristles supported on a bristle supporting portion of the toothbrush, wherein at least one resilient projecting element encapsulating a permanent magnet in the tip end portion thereof is supported on the bristle supporting portion. The height of the projecting element is somewhat lower than that of the bristles.
Inventors
- 👤 Yonesaburo Kawashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:22
CPC Classifications
A; A46; A46B; A46B15/00; A46B15/0002; A46B15/0016; A46B15/0026; A46B15/0055; A46B15/0075; A46B9/00; A46B9/06; A46D; A46D1/00; A46D1/02; A46D1/023; A46B2200/00; A46B2200/10; A46B2200/1066; B; B29; B29L; B29L2031/00; B29L2031/42; B29L2031/425
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
In a toothbrush having a plurality of bristles supported on a bristle supporting portion of the toothbrush, at least one resilient projecting element being supported on the bristle supporting portion with the height thereof being somewhat lower than that of the bristles, a permanent magnet being encapsulated in the tip end portion of the projecting element, said projecting element comprising a hollow synthetic resin tube supporting the permanent magnet at the tip thereof, and an elongated synthetic resin piece having a hardness greater than the hardness of the synthetic resin tube and disposed inside the tube at the base thereof.
Claim 2
Dependent Claim
100 words
In a toothbrush having a plurality of bristles supported on a bristle supporting portion of the toothbrush, at least one resilient projecting element being supported on the bristle supporting portion with the height thereof being somewhat lower than that of the bristles, a permanent magnet being encapsulated in the tip end portion of the projecting element, said projecting element comprising a hollow synthetic resin tube supporting the permanent magnet at the tip thereof, and an elongated synthetic resin piece having a hardness greater than the hardness of the synthetic resin tube and disposed inside the tube at the base thereof.
Claim 3
Dependent Claim
19 words
A toothbrush according to claim 1 wherein the magnetic flux density of the permanent magnet is about 2000 Gauss.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |