Where can you find information about a 22 single shot bolt action with a round barrel if the only markings are Manufactured by J Stevens A and T Co Chicopee Falls Mass USA patents applied for?

You should be able to find information on this if a patent or patents issued on the article at some time in the past. Go to www.uspto.gov. There should be a "patents" link, then there should be a link for "patent searches." Search under "issued patents" (pay attention to the date range) using keywords and you may come up with patents that relate to your subject matter and disclose lots of facts, including the inventors, assignees, relevant dates, and all the details on the article.