Lignes Telegraphiques et Telephoniques Ltt
73Patents
0Active
73Granted
38Portfolio score
Filing activity: Jan 23, 1973 → Jun 13, 1985
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4027253A | Non-reciprocal broadband slot line device | Electricity | 54 | Expired |
| US3987456A | Wide relative frequency band and reduced size-to-wavelength ratio antenna | Electricity | 53 | Expired |
| US4351059A | Method for testing a digital data transmission line between two modems and a device for the application of said method | Electricity | 40 | Expired |
| US4708425A | Bidirectional optical wavelength multiplexer-demultiplexer | Electricity | 37 | Expired |
| US4369525A | Device for automatic regulation of the output power of a transmitter module in an optical-fiber transmission system | Electricity | 33 | Expired |
| US4697873A | Device for protecting optical fibers freed at the end of a cable element | Physics | 30 | Expired |
| US4236125A | Wide band high power very high or ultra high frequency circulators | Electricity | 30 | Expired |
| US4441786A | Device for positioning optical fibers in a terminal connector for splicing two optical fiber transmission cables | Physics | 25 | Expired |
| US4399566A | Device for stabilizing the output power of a transmitter module in an optical fiber transmission system | Electricity | 21 | Expired |
| US4146867A | Adjustable resistors for hybrid circuits | Electricity | 20 | Expired |
| US4237687A | Optical fibre laying head for cable production | Physics | 19 | Expired |
| US4155963A | In-line manufacture of optical fibres cables with sequential laying | Performing Operations; Transporting | 19 | Expired |
| US4630255A | Optical multiplexer-demultiplexer for use with optical fiber wavelengths | Physics | 18 | Expired |
| US4118594A | Long distance coaxial cable with optical fibres | Electricity | 17 | Expired |
| US4258328A | Feed forward microwave amplifier for communication systems | Electricity | 15 | Expired |
| US3984208A | Anodes for solid electrolyte capacitors | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4321072A | Method for automatic centering of an optical fiber within a primary protective cladding and a device employed for carrying out said method | Chemistry; Metallurgy | 15 | Expired |
| US4309864A | Apparatus for producing cable elements incorporating otpical fibers | Physics | 15 | Expired |
| US4354732A | Cable elements comprising optical fibres and cables incorporating them | Physics | 14 | Expired |
| US4272472A | Method and apparatus for grooved section manufacture | Performing Operations; Transporting | 13 | Expired |
| US4144434A | Microwave heating devices | Electricity | 13 | Expired |
| US4059805A | Phase lock loop carrier generator for receiver of phase modulated carrier pulse signals | Electricity | 13 | Expired |
| US3985970A | Regeneration of signalling pulses | Electricity | 12 | Expired |
| US4399565A | Device for triggering an alarm system in the event of insufficiency of the transmission level, for the receiver module of an optical-fiber transmission system | Electricity | 11 | Expired |
| US4525833A | Process for time-sequenced multiplexing of data on a transmission medium and devices to implement this process | Electricity | 11 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.