GB180288A - Improvements in electrical transmission of communications - Google Patents

Improvements in electrical transmission of communications

Info

Publication number
GB180288A
GB180288A GB28888/21A GB2888821A GB180288A GB 180288 A GB180288 A GB 180288A GB 28888/21 A GB28888/21 A GB 28888/21A GB 2888821 A GB2888821 A GB 2888821A GB 180288 A GB180288 A GB 180288A
Authority
GB
United Kingdom
Prior art keywords
signalling
communications
systems
electrical transmission
wireless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB28888/21A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Pneumatic Co Inc
Original Assignee
National Pneumatic Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Pneumatic Co Inc filed Critical National Pneumatic Co Inc
Publication of GB180288A publication Critical patent/GB180288A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

180,288. National Pneumatic Co., (Assignees of Rowntree, H.). May 16, 1921, [Convention date]. Void [Published under Sect. 91 of the Act]. Secret signalling systems.-Secret signalling in systems of wireless, or wired wireless or subterranean signalling is effected by continuously varying some characteristic, for example frequency, of the transmitted waves and causing synchronously corresponding variations in the tuning of the receiver.
GB28888/21A 1921-05-16 1921-10-31 Improvements in electrical transmission of communications Expired GB180288A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US470070A US1475448A (en) 1921-05-16 1921-05-16 Electrical transmission of communications

Publications (1)

Publication Number Publication Date
GB180288A true GB180288A (en) 1922-08-10

Family

ID=23866153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28888/21A Expired GB180288A (en) 1921-05-16 1921-10-31 Improvements in electrical transmission of communications

Country Status (2)

Country Link
US (1) US1475448A (en)
GB (1) GB180288A (en)

Also Published As

Publication number Publication date
US1475448A (en) 1923-11-27

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