US4081876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toothbrushes
Assignee: Lever Brothers Co
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Filing: 1976-11-17
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Granted: 1978-04-04
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Expires: 1996-11-17
Abstract
Abstract A toothbrush comprising at least two adjacent rows of filaments of which in one row the filaments are upright and in the other the filaments are inclined. During longitudinal brushing the inclined filaments become more effective by flexing to the upright, and during lateral brushing the inclined filaments support the adjacent upright filaments against undue flexure.
Inventors
- 👤 Brinley Roy Pugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:50
CPC Classifications
A; A46; A46B; A46B9/00; A46B9/02; A46B9/04; A46B2200/00; A46B2200/10; A46B2200/1066
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A toothbrush having a longitudinally aligned handle and brushhead and within the brushhead four parallel longitudinal rows of filaments, of which the filaments in two rows extend perpendicular to said brushhead and the filaments in the other two rows, while substantially lying in longitudinal planes perpendicular to said brushhead, are inclined in the same longitudinal direction and relative to said perpendicular filaments and in which each row of filaments lies adjacent a row whose filaments are inclined relative to the filaments in that row.
Claim 2
Dependent Claim
84 words
A toothbrush having a longitudinally aligned handle and brushhead and within the brushhead four parallel longitudinal rows of filaments, of which the filaments in two rows extend perpendicular to said brushhead and the filaments in the other two rows, while substantially lying in longitudinal planes perpendicular to said brushhead, are inclined in the same longitudinal direction and relative to said perpendicular filaments and in which each row of filaments lies adjacent a row whose filaments are inclined relative to the filaments in that row.
Claim 3
Dependent Claim
35 words
A toothbrush according to claim 1 comprising four rows of filaments in which the two inner rows are perpendicular to said brushhead and the two outer rows are inclined to the perpendicular to said brushhead.
Claim 4
Dependent Claim
17 words
A toothbrush according to claim 2 in which the outer rows are inclined away from the handle.
Claim 5
Dependent Claim
30 words
A toothbrush according to claim 3 in which in each outer inclined row a tuft of filaments perpendicular to said brushhead is included at the end farthest from the handle.
Claim 6
Dependent Claim
16 words
A toothbrush according to claim 1 in which the surface is finished to a constant height.
Claim 7
Dependent Claim
19 words
A toothbrush according to claim 1 in which the angle of inclination of the inclined filaments is substantially 20°.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |