 Why did Kalvin hesitate to share information about the new invention?
He had always wanted to devote all his time to research, but Piltdon Opener had not given him that opportunity. What had happened, to the proud dream he once had, the dream of exploring uncharted engineering regions, of unlimited time to investigate and develop? "We must work along classical can-opener lines. Twenty-five years of your life you put in with Piltdon, and he'd fire you just like that if you don't do the impossible. Newspapers, magazines, radio, television and word-of-mouth spread the fame of the opener so that advertising was unnecessary. Receiving no satisfactory explanation from Piltdon, they set up their own research.
 He wanted to do more research into how it works.
 He wanted to do more research into how it works.  He wanted to be the one to tell Piltdon.  He wanted to keep the invention for himself.  He wanted to save his job.