US4980974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contoured shaving blades
Assignee: Individual
•
Filing: 1989-05-11
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Granted: 1991-01-01
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Expires: 2009-05-11
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.
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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 |