Bizarre Patents
A method for inducing cats to exercise consists of directing a beam of invisible light produced by a hand-held laser apparatus onto the floor or wall.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4754274 | Microprocessor interface device for use in a telecommunications system The microprocessor interface device is for use in a telecomminications system including a microprocessor. The device includes a first interfacing means which receives signals from, and dispatches signals to, the telecommunications system. A second interfa... | 06/28/1988 |
| 4645877 | Interface for connecting standard telephones to party lines A party line interface for permitting the connection of a standard telephone to a telephone central office which rings selected subscribers by applying a DC ringing potential of a selected polarity to a selected one of the tip and ring lines of the party ... | 02/24/1987 |
| 4528424 | Multiparty line adapter with privacy feature controlled by reversal of line polarity at a central power source A circuit for adapting a telephone subscriber line to operate as a multiparty line is described wherein a plurality of conventional single line subscriber subsets are provided telephone service on the subscriber line such that each subscriber has privacy ... | 07/09/1985 |
| 4219700 | Partyline subscriber interface circuit A station set interface circuit for connection to a multi-party line, for prohibiting connection of a party line subscriber's set to the party line in the event the line is in use and for returning busy tone to the subscriber's set. A hookswitch flash by ... | 08/26/1980 |
| 4000376 | Telephone privacy device A privacy device for a telephone to prevent, unless desired, another telephone from being connected to the pair of incoming lines to which the telephone is connected. The privacy device employs voltage responsive means which is effective upon the telephon... | 12/28/1976 |
| 4000375 | Automatic call transfer circuit for a plurality of telephones An automatic call transfer circuit for a plurality of telephones which are connected in parallel respectively between a pair of telephone lines, relay coils each one of which is connected with a different one of the telephones respectively and condensers ... | 12/28/1976 |
