Patent US3660893A successfully refreshed from Google Patents.
US3660893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replaceable blade unit for a safety razor
Assignee: Individual
•
Filing: 1970-03-24
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Granted: 1972-05-09
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Expires: 1990-03-24
Abstract
Abstract A replaceable blade unit for a safety razor in which the blade is secured in the blade unit at its ends only and the intermediate portion of the blade, on which the cutting edge is formed, is unclamped and held under tension directed longitudinally of the blade parallel to the cutting edge.
Inventors
- 👤 Norman C Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:05
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/08; B26B21/14; B26B21/16; B26B21/165; B26B21/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A replaceable blade unit for a safety razor having a support structure defining a first transversely extending support portion and a second transversely extending support portion disposed rearwardly of and spaced from said forward support portion, a blade permanently secured to said support structure at its ends only, the intermediate portion of the blade, on which the cutting edge is formed, lying clear of the support structure and being held under tension directed longitudinally of the blade, parallel to the cutting edge, said first support portion defining a guard surface for engaging the skin ahead of and spaced from the cutting edge of said blade and said second support portion defining a cap surface for engaging the skin behind and spaced from the cutting edge of said blade, said blade being disposed at an angle of less that 35* relative to the plane tangent to said first and second support portions.
Claim 2
Dependent Claim
151 words
A replaceable blade unit for a safety razor having a support structure defining a first transversely extending support portion and a second transversely extending support portion disposed rearwardly of and spaced from said forward support portion, a blade permanently secured to said support structure at its ends only, the intermediate portion of the blade, on which the cutting edge is formed, lying clear of the support structure and being held under tension directed longitudinally of the blade, parallel to the cutting edge, said first support portion defining a guard surface for engaging the skin ahead of and spaced from the cutting edge of said blade and said second support portion defining a cap surface for engaging the skin behind and spaced from the cutting edge of said blade, said blade being disposed at an angle of less that 35* relative to the plane tangent to said first and second support portions.
Claim 3
Dependent Claim
57 words
A blade unit in accordance with claim 1, in which the blade has a width not exceeding 0.125 inch and a thickness in the range from 0.0015 to 0.015 inch and is held under a tension in the range from one-half to 20 pounds weight, the tension not exceeding one half the breaking stress of the blade.
Claim 4
Dependent Claim
20 words
A blade unit in accordance with claim 2 in which the width of the blade is 0.100 inch or less.
Claim 5
Dependent Claim
24 words
A blade unit in accordance with claim 2 in which the width of the blade is in the range from 0.030 to 0.060 inch.
Claim 6
Dependent Claim
69 words
A blade unit in accordance with claim 1 and further including a second blade mounted to said support structure whereby both blades are disposed with their cutting edges parallel and arranged to follow one another over the skin to be shaved, each of said blades being secured at its ends only the intermediate portion of the blade being left unclamped and held under tension directed longitudinally of the blade.
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |