This logo does have a copyright notice but it has expired and now is in the public domain.
Teletype is no longer a registered trademark. The US Patent and Trademark Office records state "This registration was not renewed and therefore expired." This status change happened on December 15, 2000. Serial Number: 73157988, Registration Number: 1119161. The last renewal was on May 29, 1979. The trademark was transferred to AT&T on July 12, 1985 and they never renewed it. The Teletype T logo has also expired.
2011-08-15 14:07 Wa3frp 199×108× (7819 bytes) Description: Teletype Logo Author: Teletype Corporation Source: Teletype Documentation Fair Use Rationale: This was a Registered Trademark but the Trademark has expired and has not been renewed.