|
Home |
Alpha Telephone |
Domain Names |
Web Hosting |
Get Traffic |
xrEvidence |
xrSoccer
United States Utility Patents
4,081,620 - 4,081,629
Previous 10 Next 10
| Number | | Title |
|
4,081,620 |
|
Sidetone control circuit for a telephone set |
|
4,081,621 |
|
Pressure switch with diaphragm and valve means |
|
4,081,622 |
|
Electronic circuit for a speakerphone |
|
4,081,623 |
|
Sight operated telephone and machine controller |
|
4,081,624 |
|
Key telephone intercom line system |
|
4,081,625 |
|
Control circuitry for key telephone apparatus |
|
4,081,626 |
|
Electrostatic transducer having narrowed directional characteristic |
|
4,081,627 |
|
Electromagnetic bipolar loud speaker |
|
4,081,628 |
|
Microphone, particularly for body sounds, with slip coupling to the transducer element |
|
4,081,629 |
|
Snap-in bracket for mounting a telephone dial within a telephone housing |
For U.S. patent law, rules, and procedures see MPEP.
Disclaimer. Information presented on this page while believed to be reliable, is provided "as is" with no warranties of its accuracy or timeliness. For legal advice seek help of a licensed professional.
|