W D ZEHNER has a total of 14 patent applications. Its first patent ever was published in 1902. It filed its patents most often in United States. Its main competitors in its focus markets transport, electrical machinery and energy and control are OTKRYTOE AKTSIONERNOE OBSHCHESTVO NAUCHNO ISSLEDOVATELSKIJ I PROEKTNO KONSTRUKTORSKIJ INSTITUT INFOR, AUXILIAIRE D ETUDES ELECTROTEC and HYUKSHIN ENGINEERING CO LTD.
# | Country | Total Patents | |
---|---|---|---|
#1 | United States | 14 |
# | Industry | |
---|---|---|
#1 | Transport | |
#2 | Electrical machinery and energy | |
#3 | Control |
# | Technology | |
---|---|---|
#1 | Guiding railway traffic | |
#2 | Power supply for electric vehicles | |
#3 | Lighting device details | |
#4 | Special light sources | |
#5 | Alarm systems |
# | Name | Total Patents |
---|---|---|
#1 | Souder Howell W | 14 |
Publication | Filing date | Title |
---|---|---|
US800179A | Electric signaling system. | |
US795314A | Signaling system. | |
US789239A | Electric signal system. | |
US789240A | Signaling system. | |
US782285A | Signal-lamp. | |
US774897A | Block-signal system for electric railroads. | |
US773040A | Block-signal system. | |
US777555A | Electric signaling system. | |
US773039A | Signaling system. | |
US735420A | Semaphore-operating device. | |
US735419A | Trolley-contact. | |
US735418A | Signal apparatus. | |
US735417A | Electric signaling apparatus. | |
US735416A | Electric signaling apparatus. |