Patent US3703766A successfully refreshed from Google Patents.
US3703766A
Expired / Lapsed
US
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Safety razor blade
Assignee: Individual
•
Filing: 1970-07-20
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Granted: 1972-11-28
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Expires: 1990-07-20
Abstract
Abstract Improved razor blade construction formed of a planar base element having a cutting edge compositely formed of a honed sapphire filament of fine cross section bonded to an intermediate layer of glass.
Inventors
- 👤 Edward Camp Tibbals
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:28
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A safety razor blade comprising a thin planar substrate including an elongated marginal edge, and an elongated substantially monocrystalline filament of aluminum oxide having the cleavage grain thereof disposed substantially parallel to the longitudinal axis of said elongated filament secured to said elongated edge of said thin planar substrate and selectively shaped to form an acute angle cutting edge.
Claim 2
Dependent Claim
59 words
A safety razor blade comprising a thin planar substrate including an elongated marginal edge, and an elongated substantially monocrystalline filament of aluminum oxide having the cleavage grain thereof disposed substantially parallel to the longitudinal axis of said elongated filament secured to said elongated edge of said thin planar substrate and selectively shaped to form an acute angle cutting edge.
Claim 3
Dependent Claim
16 words
The razor blade construction as set forth in claim 1 wherein said substrate is stainless steel.
Claim 4
Dependent Claim
36 words
A safety razor blade according to claim 1, wherein said filament is sapphire and said safety razor blade further comprises means for securing said sapphire filament member to said elongated edge of the thin planar substrate.
Claim 5
Dependent Claim
29 words
A safety razor blade according to claim 1 including an intermediate lamina selectively bonded to said elongated marginal edge and to said filament member for securing the latter thereto.
Claim 6
Dependent Claim
25 words
The razor blade construction as set forth in claim 4 wherein said intermediate lamina is constituted from the group consisting of glass and epoxy resin.
Claim 7
Dependent Claim
23 words
The razor blade construction as set forth in claim 4 wherein said intermediate lamina is a glass of generally trapezoidal cross sectional configuration.
References Cited (Backward Citations)
US2217398A
Cited
CH207113A
Cited
US2408790A
Cited
US2582913A
Cited
US3349488A
Cited
US3543402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |