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US4980974A Expired / Lapsed US ⏱️ 0.0 years remaining

Contoured shaving blades

Assignee: Individual
•
Filing: 1989-05-11
•
Granted: 1991-01-01
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Expires: 2009-05-11
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Abstract

Abstract A conventional shaving razor having one or more vertically stacked razor blades. Each upper blade having the same length but a width less than that of the lower blade. The cutting edges of each double-edged blade is contoured on approximately a six inch radius. The rear cutting edge of each blade contoured concavely on approximately a six inch radius. The contoured cutting edges providing a smooth shave over the curved surface of the body being shaved.

Inventors

  • 👤 Allan F. Radcliffe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 18:22
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/08; B26B21/14; B26B21/22

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 152 words
A conventional shaving razor with one or more vertically stacked blades wherein the improvement comprises: (a), the blades stacked vertically in uniform alignment; (b), the blades separated by flat spacer element of a width less than that of the blade; (c), the blades and spacers being of the same length; (d), the upper blade of the stacked blades having a width less than that of the lower blade; (e), the stacked blades covered by a retainer plate of less width than the top blade; (f), the stack of blades plus the retainer plate secured to the razor base by a plurality of vertical rivets; (g), each razor blade being double-edged with one cutting edge contoured convexly at approximately a six inch radius, and the other cutting edge contoured concavely at approximately a six inch radius; (h), each stack of blades can have two differing radii within the same convex or concave assembly.
Claim 2
Dependent Claim 152 words
A conventional shaving razor with one or more vertically stacked blades wherein the improvement comprises: (a), the blades stacked vertically in uniform alignment; (b), the blades separated by flat spacer element of a width less than that of the blade; (c), the blades and spacers being of the same length; (d), the upper blade of the stacked blades having a width less than that of the lower blade; (e), the stacked blades covered by a retainer plate of less width than the top blade; (f), the stack of blades plus the retainer plate secured to the razor base by a plurality of vertical rivets; (g), each razor blade being double-edged with one cutting edge contoured convexly at approximately a six inch radius, and the other cutting edge contoured concavely at approximately a six inch radius; (h), each stack of blades can have two differing radii within the same convex or concave assembly.
Claim 3
Dependent Claim 131 words
A shaving razor head comprising: a. a plurality of blades stacked vertically in uniform alignment on a razor base; b. the blades separated by a flat spacer element of a width less than that of the blade; c. each succeeding blade having a width smaller than the adjacent lower blade; d. a retainer plate having a width less than the topmost blade; e. a plurality of ports through the razor base, the blades, the spacers and the retainer plate; f. a plurality of retainers extending through the ports and intimately securing the retainer plate, the blades and the spacers to the razor base; and g. the razor blades being double-edged with one cutting edge being contoured longitudinally and convexly inward, and with the an other cutting edge contoured longitudinally concavely outward.
Claim 4
Dependent Claim 131 words
A shaving razor head comprising: a. a plurality of blades stacked vertically in uniform alignment on a razor base; b. the blades separated by a flat spacer element of a width less than that of the blade; c. each succeeding blade having a width smaller than the adjacent lower blade; d. a retainer plate having a width less than the topmost blade; e. a plurality of ports through the razor base, the blades, the spacers and the retainer plate; f. a plurality of retainers extending through the ports and intimately securing the retainer plate, the blades and the spacers to the razor base; and g. the razor blades being double-edged with one cutting edge being contoured longitudinally and convexly inward, and with the an other cutting edge contoured longitudinally concavely outward.
Claim 5
Dependent Claim 18 words
A shaving razor head as described in claim 2 further comprising a handle attached to the razor base.
Claim 6
Dependent Claim 27 words
A shaving razor head as described in claim 3 wherein the handle is attached to the razor base at an approximate angle of 25 to 35 degrees.
Claim 7
Dependent Claim 19 words
A shaving razor head as described in claim 2 wherein the blades and spacers are approximately the same length.
Claim 8
Dependent Claim 23 words
A shaving razor head as described in claim 2 wherein the double-edged blade edges are contoured on approximately a six inch parallel radius.
Claim 9
Dependent Claim 19 words
A shaving razor head as described in claim 2 wherein the double-edged blade edges are contoured on nonparallel radii.
Claim 10
Dependent Claim 14 words
A shaving razor head as described in claim 2 wherein the retainers are rivets.
Claim 11
Dependent Claim 164 words
A shaving razor head comprising: a. a plurality of blades stacked vertically in uniform alignment on a razor base; b. the blades separated by a flat spacer element of a width less than that of the blade; c. each succeeding blade having a width smaller than the adjacent lower blade; d. a retainer plate having a width less than the topmost blade; e. a plurality of ports through the razor base, the blades, the spacers and the retainer plate; f. a plurality of rivets extending through the ports and intimately securing the retainer plate, the blades and the spacers to the razor base; g. the razor blades being double-edged with one cutting edge being contoured longitudinally and convexly inward, and with the an other cutting edge contoured longitudinally and concavely outward. h. a handle attached to the base; i. the blades and spacers having approximately the same length; and j. the front and rear blade edges contoured on approximately a six inch parallel radius.
Claim 12
Dependent Claim 164 words
A shaving razor head comprising: a. a plurality of blades stacked vertically in uniform alignment on a razor base; b. the blades separated by a flat spacer element of a width less than that of the blade; c. each succeeding blade having a width smaller than the adjacent lower blade; d. a retainer plate having a width less than the topmost blade; e. a plurality of ports through the razor base, the blades, the spacers and the retainer plate; f. a plurality of rivets extending through the ports and intimately securing the retainer plate, the blades and the spacers to the razor base; g. the razor blades being double-edged with one cutting edge being contoured longitudinally and convexly inward, and with the an other cutting edge contoured longitudinally and concavely outward. h. a handle attached to the base; i. the blades and spacers having approximately the same length; and j. the front and rear blade edges contoured on approximately a six inch parallel radius.
Claim 13
Dependent Claim 27 words
A shaving razor head as described in claim 9 wherein the handle is attached to the razor base at an approximate angle of 25 to 35 degrees.

References Cited (Backward Citations)

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US2983045A Cited
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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) 1993-12-31 1994-07-02 1995-01-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-12-31 1998-07-02 1999-01-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-12-31 2002-07-02 2003-01-01 $7700.00 Window Closed / Lapsed

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