Patent US4139940A successfully refreshed from Google Patents.
US4139940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric shaver
Assignee: Gillette Co LLC
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Filing: 1977-11-07
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Granted: 1979-02-20
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Expires: 1997-11-07
Abstract
Abstract An electric shaver is arranged to alleviate a cause of psuedofolliculitis by cutting low-lying facial hairs to a predetermined length. The electric shaver comprises a movable cutter and a perforated shaving foil having ribs protruding from a surface normally placed in contact with a user's beard. The shaving foil is arranged to move simultaneously with the cutter so that the ribs might lift and direct low-lying facial hairs through the perforations in the foil for shearing by the moving cutter.
Inventors
- 👤 Edmund M. Buras, Jr.
- 👤 Allan C. Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:59
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/38; B26B19/42; B26B19/02; B26B19/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
An electric shaver comprising: a plurality of projections extending from an outer surface of a shaving foil having a plurality of apertures, each of said apertures extending from a shaving foil outer surface to a shaving foil inner surface to form an aperture wall coextensive with a wall of one of said projections on said shaving foil outer surface, said shaving foil having a thickness equal to or exceeding 0.005 inch; cutting means positioned substantially adjacent to said shaving foil inner surface; weights attached to said cutting means for unbalancing said cutting means; and motor means for reciprocally moving said unbalanced cutting means against said shaving foil causing said shaving foil to vibrate, said apertures being arranged in only two columns between a pair of said projections separated by a predetermined distance selected to enable said projections on said vibrating foil to raise and direct low-lying hairs against said coextensive walls of said projections and apertures and into only apertures adjacent to said projections for cutting by said cutting means to a length between 0.001 and 0.010 inch determined by dimensions of said foil thickness and said apertures.
Claim 2
Dependent Claim
188 words
An electric shaver comprising: a plurality of projections extending from an outer surface of a shaving foil having a plurality of apertures, each of said apertures extending from a shaving foil outer surface to a shaving foil inner surface to form an aperture wall coextensive with a wall of one of said projections on said shaving foil outer surface, said shaving foil having a thickness equal to or exceeding 0.005 inch; cutting means positioned substantially adjacent to said shaving foil inner surface; weights attached to said cutting means for unbalancing said cutting means; and motor means for reciprocally moving said unbalanced cutting means against said shaving foil causing said shaving foil to vibrate, said apertures being arranged in only two columns between a pair of said projections separated by a predetermined distance selected to enable said projections on said vibrating foil to raise and direct low-lying hairs against said coextensive walls of said projections and apertures and into only apertures adjacent to said projections for cutting by said cutting means to a length between 0.001 and 0.010 inch determined by dimensions of said foil thickness and said apertures.
Claim 3
Dependent Claim
20 words
An electric shaver according to claim 1, wherein said shaving foil is vibrated to reciprocally move in a lateral direction.
Claim 4
Dependent Claim
37 words
An electric shaver according to claim 2, wherein said projections are substantially parallel ribs longitudinally extending across said shaving foil outer surface in a direction substantially perpendicular to said lateral direction of movement of said shaving foil.
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |