Blonder-Tongue Labs, Ben H. Tongue’s Patented inventions and early Blonder-Tongue products

Patented Inventions by Ben H. Tongue*

Patent # – Brief description – Product(s) using the invention

  • 2,609,466* – Thermorelay element – Invented by Ike Blonder – Many
  • 2661419 – Wide band audio spectrum analyzer – Model AP-1, (mfg. by Panoramic Radio Corp), released in 1948
  • 2710314 – Wide band amplifying system for low noise fixed-tuned VHF TV boosters and MATV systems – HA1-L – This is the first product manufactured by B-T
  • 2710315 – Wide band amplifying system using a quadruple tuned circuit – AB-1, CA1-B, DA8-b, HA-2-M, HA-3
  • 2733413 – Cable attenuation equalizer circuit – LLE-1, ME-1, ME-2
  • 2761022 – Amplifier system – CS-1 and UC-1 – Plug-in channel amplifiers for MA4-1
  • 2761023 – Wide band neutralized radio frequency amplifier – MLA, first version
  • 2761135 – Multi-signal electric system – MA4-1 – Combiner for CS-1 and UC-1 channelized products
  • 2776408 – High frequency transmission line coupling network – MDC-2 Two port hybrid splitter for VHF TV
  • 2778934 – Neutralized amplifier system – not used
  • 2,778,943* – Tunable elecrrical circuit elements – BTU-2, BTC-99 home-type UHF TV Converters
  • 2790036 – Neutralization of a pentode using the supressor grid – MCS single channel VHF amplifier, Hot-Shot VHF single channel amp, Powerhouse, high output VHF broadband amp. covering channels 2-13.
  • 2815406 – Wide band distribution amplifier system for VHF TV signals – DA2-1-M, DA8-1-M Two and eight output VHF dist. amps.
  • 2833924 – Amplitude stabilizer oscillating circuit (crystal oscillator) – MVC, MLC, MUC
  • 2857511 – Balanced mixer – MLC (converts any Low band VHF channel to another)
  • 2914737 – Transmission line tapoff, – MIT-4 (low insertion loss & good backmatch)
  • 2977553 – Transmission line & method of making same – A-102, A-104 signal splitters for feeding several TV sets
  • 2983876 – Electronic tuned circuit using one triode and no physical inductor – B-9 Audio Baton vacuum tube audio EQ
  • 2986706 – Coupling reducing apparatus – MLA-b, BT-3, HAB, AB-3
  • 2999985 – Electron tube stabilized amplifier (neutralize a shielded-grid tube) – BTU-2T home-type UHF TV Converter
  • 3071735 – Phase shift reducing apparatus (audio amp inverse feedback) – not used
  • 3044022 – System for wide-band neutralization – not used
  • 3156872 – Unilateralized transistor relay system – not used
  • 3239774 – Transistor power supply configuration, minimizes distortion – BT-3, Very early Broadband VHF MATV transistorized amplifier
  • 3,309,612* – Tunnel diode converter systems – BTD-44 home-type UHF converter using a tunnel diode powered by a single D cell
  • 3332022 –  –
  • 3360731 – Balanced to unbalanced impedance transformer – BTX-111, BTC-999 and BT-666 solid-state home-type UHF TV converters
  • 3413563 – Wide band transistor amplifier (inductive coupled emitter feedback) – Many broadband VHF transistor amplifier products
  • 3605031 – Wide band low distortion alternating curent amplifier – not used
  • 3624561 – Broadband aperiodic attenuator apparatus – not used
  • 3868604 – Constant resistance adjustable slope equalizer – not used

* means ‘Invention by someone other than Ben H. Tongue’

**To view some of these documents, one must be able to read .doc documents (Microsoft Word) or Adobe (.pdf) files. Some documents are fairly large, please be patient. Some documents are multi-paged – Scroll down to view them.

Some early Blonder-Tongue product literature**

Product Name – Patent(s) used

  • A-102, A-104 passive signal splitters for feeding several TVs from one antenna – 2,977,553
  • A-1 10 Watt HI-Fi audio amplifier/preamp – 3,116,462
  • Blonder-Tongue solid-state home type UHF converter line for 1971 – 3,360,731
  • BT3 – Very early transistorized VHF TV amplifier for MATV – 3,239,774
  • B-9, Audio Baton graphic equalizer – 2,983,876
  • B-T Component Home Music Center – none
  • BTD-44, UHF Converter using a tunnel diode, powered by one D cell – 3,309,612*, 3,332,022
  • BTU-2, the first B-T tunable UHF converters for home use – 2,778,943
  • CA-1B, broadband amplifier, second version, for use in MATV systems. The patents were used in many other VHF broadband amps. – 2,710,314 , 2,710,315
  • HA1-L, first catalog sheets for the first B-T product – 2,710,314
  • MCA, VHF TV strip amplifier; first production version – 2,790,036
  • MLA-b, Second version, broadband VHF TV amp, channels 2-13 – 2,986,706
  • U-Boost, UHF TV booster tuneable from channel 14-83 – none
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