Abstract Novel cutting edges and especially razor blades which have substantially better corrosion resistance, edge hardness, temper resistance, strength and ductility than those heretofore made from stainless steel and processes for making such cutting edges. Generally the cutting edges are formed from alloys comprising 30 to 60 percent cobalt, 10 to 40 percent nickel, 15 to 25 percent chromium and 5 to 12 percent molybdenum by (a) heating strips of such alloys under conditions which will result in said strips having a face centered cubic structure when cooled to room temperature, (b) cold working the strips, (c) age hardening the strips and (d) at some time during or subsequent to the coldworking step and before or after the age hardening step forming the cutting edge therein.
Inventors
👤 A Sastri
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-23 11:09
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A process as defined in claim 1 wherein said cutting edge is a razor blade.
Claim 2
Dependent Claim
27 words
A process as defined in claim 1 wherein said strip is cold worked so that there is a reduction in thickness of between 60 to 95 percent.
Claim 3
Dependent Claim
30 words
A process as defined in claim 1 wherein said heat treatment is carried out at a temperature of 800*C to 1,200*C for a period between 1 minute to 1 hour.
Claim 4
Dependent Claim
30 words
A process as defined in claim 1 wherein said age hardening is carried out at a temperature of 300*C to 700*C for periods of from 1 minute to 1 week.
Claim 5
Dependent Claim
62 words
A process as defined in claim 1 wherein said alloy is heat-treated at a temperature between 800*C to 1,200*C for a period of 1 minute to 1 hour, cold worked until there is a reduction in thickness of between 60 and 95 percent and age hardened at a temperature of 300* to 700*C for a period of 1 minute to 1 week.
Claim 6
Dependent Claim
15 words
A process as defined in claim 6 wherein said cutting edge is a razor blade.
Claim 7
Dependent Claim
46 words
A cutting edge of an alloy consisting essentially of 30 to 60 percent cobalt, 10 to 40percent nickel, 15 to 25 percent chromium, and 5 to 12 percent molybdenum, said alloy being in cold worked and age hardened condition and having a close packed hexagonal structure.
Claim 8
Dependent Claim
13 words
A cutting edge as defined in claim 8 which is a razor blade.
Claim 9
Dependent Claim
18 words
A razor blade as defined in claim 9 in which a polytetrafluoroethylene coating is on the cutting edge.