FR844539A - Wave filters - Google Patents

Wave filters

Info

Publication number
FR844539A
FR844539A FR844539DA FR844539A FR 844539 A FR844539 A FR 844539A FR 844539D A FR844539D A FR 844539DA FR 844539 A FR844539 A FR 844539A
Authority
FR
France
Prior art keywords
wave filters
filters
wave
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
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR844539A publication Critical patent/FR844539A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
FR844539D 1937-10-15 1938-10-08 Wave filters Expired FR844539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US169123A US2169301A (en) 1937-10-15 1937-10-15 Wave filter

Publications (1)

Publication Number Publication Date
FR844539A true FR844539A (en) 1939-07-26

Family

ID=22614343

Family Applications (1)

Application Number Title Priority Date Filing Date
FR844539D Expired FR844539A (en) 1937-10-15 1938-10-08 Wave filters

Country Status (3)

Country Link
US (1) US2169301A (en)
DE (1) DE743934C (en)
FR (1) FR844539A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913682A (en) * 1956-07-02 1959-11-17 Hermes Electronics Co Hybrid type filter networks
US3792294A (en) * 1972-10-19 1974-02-12 Bell Telephone Labor Inc Rectangular at-cut crystal plate
GB2043996B (en) * 1978-12-27 1983-09-07 Nihon Dempa Kogyo Co Thickness shear quartz crystal oscillator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR761166A (en) * 1932-12-03 1934-03-13 Csf Piezoelectric quartz and similar improvements

Also Published As

Publication number Publication date
US2169301A (en) 1939-08-15
DE743934C (en) 1944-01-13

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