Possible Clues:

• Inventor's concern
• Exclusive license of a sort
• George Washington signed America's first one in 1790
• Evident father needs temporary accommodation
• Plain case has lost ivory top
• Government department responsible for preventing invention fraud
• Clear evidence of invention
• Tolerating delay saying goodbye to island, that’s clear
• One of 1,093 for Thomas Edison
• Lying open, one undergoing treatment has heart removed