When was nylon invented and do the letters NY and LON stand for New York and London?

Question: When was nylon invented and do the letters NY and LON stand for New York and London?
- Keywords:
  invented,
  london,
  new york,
  nylon
Asked by nickimicki to Jim on 21 Jun 2011.
- Jim Caryl answered on 21 Jun 2011:
  
  Nylon dates from the late 1930s, and from what I’ve read (e.g. http://www.snopes.com/business/names/nylon.asp), the origin of the name is not to do with the New York (NY) – London (LON) connection, which I think was an after-thought some years later.
  
  It is in fact derived from the tendency to end the name of fabrics with ‘-on’ (cotton, rayon). Apparently the inventing chemist, Wallace Carothers, wanted it to be called ‘no run’, as it didn’t rip in long running rips like some natural fabrics (nylon tends to form right-angles tears). The chemical company DuPont didn’t like the name, so after much revision he came up with Nyl-on.

Question: When was nylon invented and do the letters NY and LON stand for New York and London?