Radio signalling systems

Details Radio signalling systems Radio signalling systems

1977-03-16

1979-07-24

Bookbinder, Marc E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 64, 325143, 325364, 340539, 343225, H04B 700

Patent

active

041624483

ABSTRACT:
This invention is a radio frequency identity system in which each user has a token containing a low power transmitter. If he wants to enter a security area, a receiver operates to let him enter if it recognizes that the transmission is correct. A correct transmission is one having a set number of R.F. carrier cycles between successive modulation pulses.
In an alarm system a user can identify himself in a similar manner.

REFERENCES:
patent: 3197563 (1965-07-01), Hamsher et al.
patent: 3207850 (1965-09-01), Foreman
patent: 3391623 (1968-07-01), Tabankin
patent: 3440353 (1969-04-01), Salmet
patent: 3440635 (1969-04-01), Hull
patent: 3530451 (1970-09-01), Devine
patent: 3721910 (1973-03-01), Willmans et al.
patent: 3902478 (1975-09-01), Konopasek et al.
patent: 3990006 (1976-11-01), Zebo
patent: 3990007 (1976-11-01), Hohhof
patent: 4005428 (1977-01-01), Graham

Affiliated with

Also associated with

Rating

Radio signalling systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Radio signalling systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio signalling systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1289171