Telephone line noise filter apparatus

Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

379414, 379416, H04M 100

Patent

active

050739247

ABSTRACT:
Filter circuitry for filtering noise from a pair of telephone conductors connected to a modem or a facsimile transmission unit includes a capacitor in series with a fixed resistor. A vaariable resistor is connected in series with the capacitor and the fixed resistor. The capacitor is non-polarized. A switch is connected in series with the filter elements for selectively connecting and disconnecting the filter from the telephone conductors.

REFERENCES:
patent: 308019 (1884-11-01), Hoevenbergh
patent: 781525 (1905-01-01), Stone
patent: 1791377 (1931-02-01), Proskauer et al.
patent: 1824819 (1931-09-01), Houck
patent: 1949996 (1934-03-01), Fleming
patent: 2277216 (1942-03-01), Epstein
patent: 2621252 (1952-12-01), Pontius
patent: 2732528 (1956-01-01), Anderson
patent: 3009121 (1961-11-01), Loebenstein
patent: 3270142 (1966-08-01), Wilson
patent: 3305801 (1967-02-01), Hartenstein
patent: 3350510 (1967-10-01), Knauer et al.
patent: 3402372 (1968-09-01), Wasyluk
patent: 3582563 (1971-06-01), Cragg
patent: 4498010 (1985-02-01), Lofmark
patent: 4701946 (1987-10-01), Oliva et al.
patent: 4723278 (1988-02-01), Nishio et al.
patent: 4759059 (1988-07-01), Christensen
patent: 4951312 (1990-08-01), Tanikawa et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Telephone line noise filter apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

     

Profile ID: LFUS-PAI-O-839371

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.