US4131967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toothbrush
Assignee: Individual
•
Filing: 1976-07-01
•
Granted: 1979-01-02
•
Expires: 1996-07-01
Abstract
Abstract A toothbrush which comprises an elongated handle including a U-shaped head coaxial with a front end of the handle. The head is provided with two opposite bristles-carrying portions located to opposite sides of an axis of the head and each of the portions has a front edge which is inclined at an acute angle to the axis. The toothbrush further includes a plurality of bristle tufts which are spaced from each other inwardly from the bristle-carrying portions and are arranged in a first plurality of rows which is substantially parallel to the front edge and in a second plurality of rows parallel to the axis. The ends of the bristles in the second plurality of rows on the opposite bristles-carrying portions are arranged to define an acute gap therebetween.
Inventors
- 👤 Karl-Heinz Northemann
- 👤 Heinrich Krahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:43
CPC Classifications
A; A46; A46B; A46B5/00; A46B5/0004; A46B5/0012; A46B9/00; A46B9/02; A46B9/04; A46B9/045; A61; A61C; A61C17/00; A61C17/16; A61C17/22; A61C17/32; A61C17/34; A46B2200/00; A46B2200/10; A46B2200/1066
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
173 words
A toothbrush comprising an elongated handle having a longitudinal axis, a front end and a rear end, a U-shaped head coaxial with said front end of the handle, said head having two opposite bristles-carrying portions located to opposite sides of said axis and each of said bristles-carrying portions having a front edge inclined at an acute angle to said axis; and a plurality of bristle tufts projecting spaced from each other inwardly from said bristles-carrying portions and being arranged in a first plurality of rows substantially parallel to said front edge and in a second plurality of rows parallel to said axis, said first and second plurality of rows intersecting each other at four corner points and the axes of the tufts of bristles at said four corner points extending inclined toward each other and the ends of said bristles in said second plurality of rows on said opposite bristles-carrying portions being arranged to define an acute gap therebetween, said handle having rearwardly of said head a portion curved transversely to said axis.
Claim 2
Dependent Claim
173 words
A toothbrush comprising an elongated handle having a longitudinal axis, a front end and a rear end, a U-shaped head coaxial with said front end of the handle, said head having two opposite bristles-carrying portions located to opposite sides of said axis and each of said bristles-carrying portions having a front edge inclined at an acute angle to said axis; and a plurality of bristle tufts projecting spaced from each other inwardly from said bristles-carrying portions and being arranged in a first plurality of rows substantially parallel to said front edge and in a second plurality of rows parallel to said axis, said first and second plurality of rows intersecting each other at four corner points and the axes of the tufts of bristles at said four corner points extending inclined toward each other and the ends of said bristles in said second plurality of rows on said opposite bristles-carrying portions being arranged to define an acute gap therebetween, said handle having rearwardly of said head a portion curved transversely to said axis.
Claim 3
Dependent Claim
29 words
A toothbrush as defined in claim 1 and including coupling means at said rear end of said handle for coupling means thereto for oscillating said toothbrush about said axis.
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) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |