Hopefully pinning the links will make locating this information easier. Thanks to Antonios for originally organizing the information.
If you have additional patents to add re the companies listed here - go to the thread and add there. For companies not listed, please add the thread in the usual manner, then I'll link here.
Gerry
Esterbrook Patents
Eversharp - Wahl Patents
Parker Patents
Sheaffer Patents
Waterman Patents
Wearever Patents
Edited to add Parker and Sheaffer.
Edited to add Esterbrook.