Mailbox

Details Mailbox Mailbox

1985-06-21

1986-12-30

Swiatek, Robert P.

Communications: electrical

Condition responsive indicating system

Specific condition

232 37, G08B 1316

Patent

active

046332367

ABSTRACT:
A mailbox including an indicator indicating the presence of mail, if any, and including a detector having a transmitting and receiving ultrasonic transducer. The transducer transmits ultrasonic waves into the mailbox and based on the received ultrasonic waves indicates alterations in the reflected energy. In this manner mail in the mailbox is detected even if the mail does not take up much room. The detector detects alterations in the frequency as a consequence of movements in the mailbox or detects alterations in the pattern of reflection as mail in the mailbox is disturbing the propagation paths of ultrasound in the mailbox.

REFERENCES:
patent: 2038878 (1936-04-01), Strutt
patent: 2197028 (1940-04-01), Wolff
patent: 2968804 (1961-01-01), Buffington
patent: 3309689 (1967-03-01), Keeney
patent: 3634884 (1972-01-01), Ross
patent: 3909819 (1975-09-01), Radford

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1550450