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US4741103A Expired / Lapsed US ⏱️ 0.0 years remaining

Razor for shaving a face having pseudofolliculitis barbae

Assignee: Warner Lambert Co LLC
•
Filing: 1986-07-25
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Granted: 1988-05-03
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Expires: 2006-07-25
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Abstract

Abstract This invention provides a razor having a knurled guard bar and a single sharp blade particularly adopted for shaving one suffering from pseudofolliculitis barbae.

Inventors

  • 👤 Carl A. Hultman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 15:38
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/02; B26B21/40; B26B21/4012; B26B21/4018; B26B19/00; B26B19/38; B26B19/42; B26B21/08; B26B21/14; B26B21/16; B26B21/4025

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 50 words
Guard bar for a razor comprising at least ten closely spaced knurls, having a series of closely spaced truncated cones having four upwardly tapering sides, per lineal guard bar inch as measured across the long axis of the guard bar, said knurls defining a discontinuous upper surface by their top.
Claim 2
Dependent Claim 50 words
Guard bar for a razor comprising at least ten closely spaced knurls, having a series of closely spaced truncated cones having four upwardly tapering sides, per lineal guard bar inch as measured across the long axis of the guard bar, said knurls defining a discontinuous upper surface by their top.
Claim 3
Dependent Claim 23 words
The guard bar of claim 1 wherein the knurl has an upper surface defined by sides between 0.004 and 0.0005 in. in length.
Claim 4
Dependent Claim 34 words
The guard bar according to claims 1 or 2 wherein the height of the upper surface is at least 0.002 in. as measured from the space between knurls to the top of the knurl.
Claim 5
Dependent Claim 23 words
The Guardbar of claim 1 wherein the angle formed by the side and the top of the knurl is between 30° and 90°.
Claim 6
Dependent Claim 116 words
A razor system comprising in combination: (a) A blade assembly with a single blade having a shaving edge; (b) A handle; (c) A blade seat for supporting said blade assembly and maintaining said blade at a predetermined shaving angle extending at an angle from the end of said handle and also extending beyond the blade edge to form a guard bar; (d) Said guard bar having at least 10 closely spaced knurls, having a series of closely spaced truncated cones having four upwardly tapering sides, per lineal inch as measured along the long axis of the guard bar.; and (e) A cap positioned above said blade connected with at least said handle or said blade seat.
Claim 7
Dependent Claim 116 words
A razor system comprising in combination: (a) A blade assembly with a single blade having a shaving edge; (b) A handle; (c) A blade seat for supporting said blade assembly and maintaining said blade at a predetermined shaving angle extending at an angle from the end of said handle and also extending beyond the blade edge to form a guard bar; (d) Said guard bar having at least 10 closely spaced knurls, having a series of closely spaced truncated cones having four upwardly tapering sides, per lineal inch as measured along the long axis of the guard bar.; and (e) A cap positioned above said blade connected with at least said handle or said blade seat.
Claim 8
Dependent Claim 23 words
The razor system according to claim 5 wherein the guard bar has at least twenty closely spaced knurls to the lineal transverse inch.
Claim 9
Dependent Claim 27 words
The razor system according to claims 5 or 6 wherein the guardbar has a plurality of transversely extending rows of knurls parallel to said blade shaving edge.
Claim 10
Dependent Claim 20 words
The razor system according to claim 5 wherein said cap has fingers extending essentially to the edge of said blade.
Claim 11
Dependent Claim 20 words
The razor system according to claim 5 wherein the blade has a radius of curvature between 400 and 800 Angstroms.
Claim 12
Dependent Claim 23 words
The razor system according to claims 5 or 9 wherein the blade has a gothic arch angle between about 35° to about 80°.
Claim 13
Dependent Claim 15 words
The razor system according to claim 5 wherein velcro patch is provided on said handle.
Claim 14
Dependent Claim 17 words
The razor system according to claim 5 wherein the blade exposure is between 0.001 and 0.004 inches.
Claim 15
Dependent Claim 16 words
The razor system according to claim 5 wherein the span is between 0.005 and 0.0066 inches.

References Cited (Backward Citations)

US2068085A Cited
US2780862A Cited
US3138865A Cited
US3722090A Cited
US3909939A Cited
US4189832A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-05-03 1991-11-02 1992-05-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-05-03 1995-11-02 1996-05-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-05-03 1999-11-02 2000-05-03 $7700.00 Window Closed / Lapsed

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