It's tough to get an accurate date on a glove with just the patent date. Every now and then I'll see a mid 1950s glove on ebay that the seller thinks is from 1941 because of the patent number stamped on it. The best way to pin it down is with Joe Phillips' Catalog Source Book. Then check JD's
http://www.baseballglovecollector.com to see if there's a copy of the catalog that shows the glove. It's really helpful especially if you have a glove model that was made for quite a few years, say like Wilson's Rogers Hornsby 648 which spanned 1927-41. Unfortunately, hardly any catalog information has turned up for Denkert. I think that all you can do for now is make an educated guess based on the web and unique seam style on your glove. Early 1930s
Denkert did make their own line of gloves as well as supplying them for department and sporting goods outlets under those stores' labels.