Trademarks
Trademarks of competitor companies
https://trademarks.justia.com/861/79/ring-86179216.html
RING™ is an Amazon-owned video doorbell company.
https://trademarks.justia.com/866/68/nest-86668941.html
NEST™ is a Google-owned video doorbell company.
https://trademarks.justia.com/888/49/control4-chime-video-88849500.html
CONTROL4 CHIME VIDEO DOORBELL™ is a Control4-owned video doorbell company.
Copyrights
This design uses no copyrighted elements.
Patents
https://patents.google.com/patent/US5428388A/en
Patented by Richard P. von Bauer and Douglas W. Eberlen in 1995
A sensor and monitor station used to acquire information from a remote area
https://patents.google.com/patent/CA2557747A1/en
Patented by Peter Bernhard Kristjansen in 2006
The unique aspect of this patent is that this camera doorbell is similar to a telephone system. Pressing the bell initiates a connection to the reciever that a person accepts.
https://patents.google.com/patent/US20120044050A1/en?q=Smart+doorbell&oq=Smart+doorbell
Patented by Samir Vig and Shamila Vig in 2010
The unique aspect of this is a built in identification system using a keycard scanner which is connected to a database.