Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4771450 | Method and apparatus for converting rotary signals to audiofrequency signals | Marcelo Castro | 1988-09-13 |
| 4625079 | Method and apparatus for activating through phone telecommand an announcer-recorder, and for selectively activating through the sending of codes consisting of signals at least another automatic call attention phone device | Marcelo Castro | 1986-11-25 |
| 4618742 | Method and apparatus for decoding audiofrequency information sent through rotary dialing | — | 1986-10-21 |
| 4549045 | Method to operate through a telephone line one automatic phone answering equipment specified among a plurality, and apparatus to carry it out | Marcelo Castro | 1985-10-22 |
| 4453041 | Method and apparatus for processing coded information received through a telephone line during the non-active intervals of a ringing period | Marcelo Castro | 1984-06-05 |
| 4387272 | Method and apparatus for controlling a subscriber phone system including at least one automatic phone-answering machine | Marcelo Castro | 1983-06-07 |
| 4383138 | Method and apparatus for processing coded information received through a telephone line during the inter-ringing periods | Marcelo Castro | 1983-05-10 |
| 4369339 | Method for completing the connection between a telephone exchange and the phone subscriber's line in response to the reception, at the exchange, of a pre-established code | Marcelo Castro | 1983-01-18 |