US3842499A
Expired / Lapsed
US
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Razor blade assembly
Assignee: Gillette Co LLC
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Filing: 1972-09-08
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Granted: 1974-10-22
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Expires: 1992-09-08
Abstract
Abstract A razor blade assembly having one or more groups of multiple cutting edge, tandem acting shaving elements assembled on a generally rectangular supporting structure or frame. Each group of cutting elements comprises two or more blades, the cutting edges of which are located in spaced, parallel, tandem acting relationship. One or more of the cutting edges of each group is essentially chisel shaped. The dimensions of the frame and the disposition and orientation of the cutting edges are such as to cooperatively provide, in a conventional razor, favorable geometry for tandem blade shaving operations.
Inventors
- 👤 F Dorion
- 👤 P Douglass
- 👤 W Nissen
- 👤 R Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:34
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
160 words
A razor blade assembly comprising: a. a frame in the form of a spacer member, said spacer member having an elongated central base portion and a ramp portion on each side thereof, said ramp portions having a pair of surfaces thereon and being permanently inclined at an angle of 13*-16* relative to said base portion, b. a planar first blade disposed on one surface of each of said ramp portions and having a first cutting edge extending beyond an edge of said frame, c. a planar second blade disposed on the other surface of each of said ramp portions and having a second cutting edge extending a second distance beyond said edge of said frame, d. said surfaces having a maximum separation of 0.006-0.02 inch, e. at least one said blades having a cutting edge such that a bisector of an angle defined by surfaces of the cutting edge is disposed at an angle to the plane of such blade.
Claim 2
Dependent Claim
160 words
A razor blade assembly comprising: a. a frame in the form of a spacer member, said spacer member having an elongated central base portion and a ramp portion on each side thereof, said ramp portions having a pair of surfaces thereon and being permanently inclined at an angle of 13*-16* relative to said base portion, b. a planar first blade disposed on one surface of each of said ramp portions and having a first cutting edge extending beyond an edge of said frame, c. a planar second blade disposed on the other surface of each of said ramp portions and having a second cutting edge extending a second distance beyond said edge of said frame, d. said surfaces having a maximum separation of 0.006-0.02 inch, e. at least one said blades having a cutting edge such that a bisector of an angle defined by surfaces of the cutting edge is disposed at an angle to the plane of such blade.
Claim 3
Dependent Claim
31 words
The razor blade assembly as defined by claim 1 in which each of said ramp portions is inclined at an angle of about 15* to the plane of said base portion.
Claim 4
Dependent Claim
17 words
The razor blade assembly as defined by claim 1 in which said spacer member is of metal.
Claim 5
Dependent Claim
20 words
The razor blade assembly as defined by claim 3 in which said blade elements are welded to said spacer member.
Claim 6
Dependent Claim
21 words
The razor blade assembly as defined by claim 4 in which said blade elements and said spacer are of stainless steel.
Claim 7
Dependent Claim
25 words
The razor blade assembly as defined by claim 1 in which the thickness of said spacer member between said blade portions is about 0.01 inch.
Claim 8
Dependent Claim
51 words
The razor blade assembly as defined by claim 1 in which said spacer member is of metal and is about 1.68 inch in length, about 0.867 inch in width, and is about 0.010 inch in thickness, said ramp portions being inclined to said base portion at an angle of about 15*.
Claim 9
Dependent Claim
18 words
The razor blade assembly as defined by claim 1 in which said first distance exceeds said second distance.
Claim 10
Dependent Claim
36 words
The razor blade assembly as defined by claim 1 in which each of said blade elements is of metal, is about 1.42 inch in length, about 0.189 inch in width, and about 0.004 inch in thickness.
Claim 11
Dependent Claim
138 words
Razor blade assembly comprising a relatively thin spacer member having an elongated central planar base portion flanked on each longitudinal side edge by an integral depending skirt portion, said skirt portions being permanently inclined at a predetermined substantially constant angle relative to said central base portion, first and second separate, distinct, planar blades disposed on the first of said integral depending skirt portions and separated thereby, said first and second blades having respectively first and second cutting edges facing outwardly from said assembly, and third and fourth separate, distinct, planar blades disposed on the second of said integral depending skirt portions and separated thereby, said third and fourth blades having respectively third and fourth cutting edges facing outwardly from said assembly and in a direction generally opposite to the direction in which said first and second edges face.
Claim 12
Dependent Claim
138 words
Razor blade assembly comprising a relatively thin spacer member having an elongated central planar base portion flanked on each longitudinal side edge by an integral depending skirt portion, said skirt portions being permanently inclined at a predetermined substantially constant angle relative to said central base portion, first and second separate, distinct, planar blades disposed on the first of said integral depending skirt portions and separated thereby, said first and second blades having respectively first and second cutting edges facing outwardly from said assembly, and third and fourth separate, distinct, planar blades disposed on the second of said integral depending skirt portions and separated thereby, said third and fourth blades having respectively third and fourth cutting edges facing outwardly from said assembly and in a direction generally opposite to the direction in which said first and second edges face.
Claim 13
Dependent Claim
13 words
The invention according to claim 10 in which said spacer member is metal.
Claim 14
Dependent Claim
23 words
The invention according to claim 10 in which said depending skirt portions are permanently inclined relative to the base portion by about 13*-16*.
Claim 15
Dependent Claim
57 words
The invention according to claim 10 in which said second blade cutting edge is recessed relative to said first blade cutting edge and in cutting operation trails said first blade cutting edge and said fourth blade cutting edge is recessed relative to said third blade cutting edge and in cutting operation trails said third blade cutting edge.
Claim 16
Dependent Claim
22 words
The invention according to claim 13 in which the span of said second blade and said fourth blade is about 0.02-0.055 inch.
Claim 17
Dependent Claim
22 words
The invention according to claim 13 in which the blade tangent angle for said second and fourth blade is less than 30*.
Claim 18
Dependent Claim
25 words
The invention according to claim 10 in which said spacer member and said blade are fixed together with said blades contiguous to said spacer member.
Claim 19
Dependent Claim
18 words
The invention according to claim 15 in which said blade tangent angle is in the range of 22*-26*.
Claim 20
Dependent Claim
15 words
The invention according to claim 15 in which said blade tangent angle is about 23.5*.
Claim 21
Dependent Claim
15 words
A razor blade assembly as defined in claim 10 wherein said spacer is substantially rigid.
Claim 22
Dependent Claim
150 words
Razor blade assembly comprising a frame portion, two groups of blades, each group comprising a planar first blade having a first cutting edge extending beyond an edge of said frame portion, a planar second blade having a second cutting edge extending in the same direction as said first blade, said frame portion having a thickness of about 0.006-0.02 inch, said first and second cutting edges having a span therebetween of 0.02-0.055 inch, and said second cutting edge having a blade tangent angle of less than 30*, said first and second blades being assembled on said frame portion such that said first and second cutting edges are located in spaced, parallel tandem acting relationship with said frame portion disposed therebetween, one of said cutting edges being such that a bisector of an angle defined by surfaces of the cutting edge is disposed at an angle to the plane of such blade.
Claim 23
Dependent Claim
150 words
Razor blade assembly comprising a frame portion, two groups of blades, each group comprising a planar first blade having a first cutting edge extending beyond an edge of said frame portion, a planar second blade having a second cutting edge extending in the same direction as said first blade, said frame portion having a thickness of about 0.006-0.02 inch, said first and second cutting edges having a span therebetween of 0.02-0.055 inch, and said second cutting edge having a blade tangent angle of less than 30*, said first and second blades being assembled on said frame portion such that said first and second cutting edges are located in spaced, parallel tandem acting relationship with said frame portion disposed therebetween, one of said cutting edges being such that a bisector of an angle defined by surfaces of the cutting edge is disposed at an angle to the plane of such blade.
Claim 24
Dependent Claim
17 words
The razor blade assembly as defined by claim 20 in which said second-mentioned angle is about 7*.
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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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |