Are these really Stainless?

Shamelessly lifted from another forum:


Find the full (very long and very interesting) article by Googling the patent number, its the second result.

So stainless blades but uncoated unlike the 1960s WS.
 
The patent is from 1933 and covers blades with a hard cutting edge and a softer centre of the blade to give both sharpness and flexibility. No mention of "stainless" in the patent.
Cheeky how they claim that selling the blades at an 'unauthorised' price constitutes a patent infringement.
 
@jmudrick just posted this over on ATG as I had posted there as well.

"Some of the most interesting plant installed in the factory is used in connection with the manufacture of blades. The blades are not made singly but are produced end-to-end in one long ribbon of steel, the parting-off operation being actually the last performed before final inspection, and being done after hardening, sharpening, and stropping. We may consider here the manufacture of safety blades of the Gillette type. These are made in a variety of designs to suit razors of different patterns, and are usually produced from 1.25 percent carbon steel which includes about 0.3 per cent of chromium. As is well known, ineffective drying of a blade after shaving is the chief cause of the edges losing their keenness. When moisture is allowed to remain on the edges, corrosion sets in very rapidly, with the result that the initial sharpness of the blade is soon destroyed. To offset this, a special brand of Gillette blade is made from stainless steel, and with these blades drying after shaving is unnecessary. Generally speaking a stainless steel blade may be expected to retain the keenness of its edges for a much longer period than a blade of ordinary steel"

Machinery and Production Engineering (London), vol. 53 no. 1357 (1938, p33-38
 
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