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Patent US4192719A successfully refreshed from Google Patents.
US4192719A
Expired / Lapsed
US
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Method of making a shearfoil for dry shavers
Assignee: Braun GmbH
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Filing: 1978-04-20
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Granted: 1980-03-11
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Expires: 1998-04-20
Abstract
Abstract An apertured shearfoil is galvanically provided on its skin-contacting surface with collar-like protuberances surrounding the respective apertures.
Inventors
- 👤 Robert Wich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:16
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
In a method of making a dry shaver shearfoil capable of erecting the beard hair of a user, the steps of providing a shearfoil having a plurality of apertures and a surface adapted to contact the skin of a user; applying a coating of an electrically non-conductive substance on said surface of said shearfoil, excepting said apertures; galvanically depositing metallic material on said surface only about and immediately proximal to said apertures, so as to form collar-like protuberances adapted to erect a user's bear hair by tensioning the skin when the shearfoil is moved over the skin in contact therewith; and removing said non-conductive substance from said surface.
Claim 2
Dependent Claim
108 words
In a method of making a dry shaver shearfoil capable of erecting the beard hair of a user, the steps of providing a shearfoil having a plurality of apertures and a surface adapted to contact the skin of a user; applying a coating of an electrically non-conductive substance on said surface of said shearfoil, excepting said apertures; galvanically depositing metallic material on said surface only about and immediately proximal to said apertures, so as to form collar-like protuberances adapted to erect a user's bear hair by tensioning the skin when the shearfoil is moved over the skin in contact therewith; and removing said non-conductive substance from said surface.
Claim 3
Dependent Claim
14 words
A method as defined in claim 1, wherein said substance is a photo lacquer.
Claim 4
Dependent Claim
20 words
A method as defined in claim 1, wherein the step of applying comprises printing said substance onto said one surface.
Claim 5
Dependent Claim
41 words
A method as defined in claim 1; and further comprising the step of activating said substance prior to the step of galvanically depositing, so as to remove said substance from said one surface in narrow annular zones about the respective apertures.
Claim 6
Dependent Claim
13 words
A method as defined in claim 1, wherein said metallic material is nickel.
Claim 7
Dependent Claim
40 words
A method as defined in claim 1, wherein said shearfoil is carried on a substrate which engages an opposite surface of the shearfoil during the preceding steps; and further comprising the subsequent step of separating said shearfoil from said substrate.
Claim 8
Dependent Claim
25 words
A method as defined in claim 1, wherein the step of providing comprises forming the shearfoil by galvanic deposition of metallic material on a substrate.
References Cited (Backward Citations)
US3498891A
Cited
US3726770A
Cited
CH519582A
Cited
US3655528A
Cited
US4039397A
Cited
US4056992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |