Patent US4128910A successfully refreshed from Google Patents.
US4128910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toothbrush
Assignee: PIGEON KK
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Filing: 1977-05-04
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Granted: 1978-12-12
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Expires: 1997-05-04
Abstract
Abstract A toothbrush having a handle and a rubber-like brushing structure having a plurality of brushing projections and mounted on the forward part of the handle is further provided with a rigid frame member surrounding the side surface of the brushing structure and engaged with the latter in a projection-and-recess relation, the frame member being bonded to the handle for indirectly securing the brushing structure to the handle, and the "hardness" in operation of the toothbrush, i.e., the brushing projections, being adjusted by varying the height of the frame member measured perpendicularly to the lengthwise direction of the handle.
Inventors
- 👤 Yuichi Nakata
- 👤 Tadayoshi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:23
CPC Classifications
A; A46; A46B; A46B9/00; A46B9/08; A46B9/12; A46B3/00; A46B3/005; A46B7/00; A46B2200/00; A46B2200/10; A46B2200/1066
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A toothbrush for infants and young children, which comprises a rigid handle having one end for attachment of a brush structure thereto and defining a recess to the one end, a brush structure having a plurality of projections extending substantially parallel to one another, made of a soft resilient rubber-like material and attached to one end of the handle with the projections projecting therefrom, and a rigid frame member fixedly located in the recess and defining an opening supporting the periphery of brush structure adjacent the one end of the handle to an extent to provide a desired restraint against bending of the projections, thereby to provide the brush structure with a desired stiffness wherein said brush structure has an anchoring part, and a core groove formed internally of the anchoring part, and said handle is formed on a surface at the forward end thereof with a groove for receiving the anchoring part and a core projection to be inserted into the core groove in the brush structure.
Claim 2
Dependent Claim
168 words
A toothbrush for infants and young children, which comprises a rigid handle having one end for attachment of a brush structure thereto and defining a recess to the one end, a brush structure having a plurality of projections extending substantially parallel to one another, made of a soft resilient rubber-like material and attached to one end of the handle with the projections projecting therefrom, and a rigid frame member fixedly located in the recess and defining an opening supporting the periphery of brush structure adjacent the one end of the handle to an extent to provide a desired restraint against bending of the projections, thereby to provide the brush structure with a desired stiffness wherein said brush structure has an anchoring part, and a core groove formed internally of the anchoring part, and said handle is formed on a surface at the forward end thereof with a groove for receiving the anchoring part and a core projection to be inserted into the core groove in the brush structure.
Claim 3
Dependent Claim
35 words
A toothbrush as claimed in claim 1 wherein a peripheral groove is formed around the outer surface of the brush structure and the frame member has an inwardly projecting flange, located in this peripheral groove.
Claim 4
Dependent Claim
62 words
A toothbrush as claimed in claim 1 wherein said projections of the brush structure are three longitudinally extending projections disposed in side-by-side arrangement in the transverse direction of the toothbrush, each of the projections having a triangular cross-section, the right side projection and the left side projection having their top ridgelines deflected respectively rightwardly and leftwardly from that of the central projection.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |