Some inventions are solutions in search of problems. The double double edged blade is a prime example, double so in J O Plesch’s itteration of the idea. Not just a double double edged blade, but attempting to be a slant at the same time. And likely prone to blade chatter. However, as the patent explains, his intentions were good:
Recently razors.click tweeted about a razor patent that I’ve never seen before and it has some really intriguing features. It was filed in 1908, and the patent granted in 1912. It’s a patent by Clifford E Dunn, whom we have meet before.
One of described forms is a single edge razor using a double edge blade – not a unique idea by itself, but this is one of the earliest ones I know of. That design is set up to use Gillette’s three hole blade1 – thus avoiding having to reintroduce yet another blade on the market. Other forms can use a single edged blade – the early Gem blade might work, or a Christy style blade.
On to the patent, which described – according to the text – “certain new and useful Improvements in Safety-Razors”. To quote:
I’ve mentioned the Christy razor in the past, as well as other razors that built on the same idea or used Christy blades. As mentioned, the blades at least were for sale until the early thirties. What I found today shows that razors themselves were offered until at least 1927, competing for the low end of the market.