Thank you for this very interesting post. It is most apparent that the following be a significiant part of the patent for what ever reason. In addition, it is a very good description of the phrase "fly fishing".
I quote the patent.


[0006] Fly-fishing requires a rod that casts a weighted line and its attached fly, to a targeted fish. The fly is essentially a lure, sometimes imitating food for a fish. It is delivered despite wind or adverse weather, around or close to obstacles such as brush or trees, in a manner over distance and with controllable accuracy in a way that does not spook the fish. The speed at which the line travels smoothly determines the carry distance of the fly. The ability of the rod to turn over the line and impart speed smoothly to it is termed its rod action, and conveys the impression of power and control to the user. Although tapered bamboo sticks of the distant past could theoretically achieve this function, most were heavy and not straight, strong, or flexible enough to satisfy the demands of the time.

Someone did their homework.