GB509040A - Improvements in electrical frequency selective circuits - Google Patents

Improvements in electrical frequency selective circuits

Info

Publication number: GB509040A
Authority: GB; United Kingdom
Prior art keywords: frequency selective; electrical frequency; selective circuits; circuits; electrical
Prior art date: 1937-10-06
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

GB27130/37A

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.)

Individual

Original Assignee

Individual

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.)

1937-10-06

Filing date

1937-10-06

Publication date

1939-07-06

1937-10-06 Application filed by Individual filed Critical Individual

1937-10-06 Priority to GB27130/37A priority Critical patent/GB509040A/en

1937-10-06 Priority to GB12014/39A priority patent/GB509235A/en

1938-05-09 Priority to GB13848/38A priority patent/GB515739A/en

1938-06-08 Priority to GB17082/38A priority patent/GB515640A/en

1938-09-28 Priority to US232194A priority patent/US2266658A/en

1938-10-06 Priority to FR844373D priority patent/FR844373A/en

1939-07-06 Publication of GB509040A publication Critical patent/GB509040A/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; 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)
Filters And Equalizers (AREA)
Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Oscillators With Electromechanical Resonators (AREA)

GB27130/37A 1937-10-06 1937-10-06 Improvements in electrical frequency selective circuits Expired GB509040A (en)

Priority Applications (6)

Application Number	Priority Date	Filing Date	Title
GB27130/37A GB509040A (en)	1937-10-06	1937-10-06	Improvements in electrical frequency selective circuits
GB12014/39A GB509235A (en)	1937-10-06	1937-10-06	Improvements in electrical frequency selective systems
GB13848/38A GB515739A (en)	1937-10-06	1938-05-09	Improvements in electrical frequency selective apparatus
GB17082/38A GB515640A (en)	1937-10-06	1938-06-08	Improvements in electrical frequency-selective systems
US232194A US2266658A (en)	1937-10-06	1938-09-28	Electrical frequency-selective system
FR844373D FR844373A (en)	1937-10-06	1938-10-06	Improvements to frequency-selective electrical systems

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB27130/37A GB509040A (en)	1937-10-06	1937-10-06	Improvements in electrical frequency selective circuits

Publications (1)

Publication Number	Publication Date
GB509040A true GB509040A (en)	1939-07-06

Family

ID=10254703

Family Applications (4)

Application Number	Title	Priority Date	Filing Date
GB12014/39A Expired GB509235A (en)	1937-10-06	1937-10-06	Improvements in electrical frequency selective systems
GB27130/37A Expired GB509040A (en)	1937-10-06	1937-10-06	Improvements in electrical frequency selective circuits
GB13848/38A Expired GB515739A (en)	1937-10-06	1938-05-09	Improvements in electrical frequency selective apparatus
GB17082/38A Expired GB515640A (en)	1937-10-06	1938-06-08	Improvements in electrical frequency-selective systems

Family Applications Before (1)

Application Number	Title	Priority Date	Filing Date
GB12014/39A Expired GB509235A (en)	1937-10-06	1937-10-06	Improvements in electrical frequency selective systems

Family Applications After (2)

Application Number	Title	Priority Date	Filing Date
GB13848/38A Expired GB515739A (en)	1937-10-06	1938-05-09	Improvements in electrical frequency selective apparatus
GB17082/38A Expired GB515640A (en)	1937-10-06	1938-06-08	Improvements in electrical frequency-selective systems

Country Status (3)

Country	Link
US (1)	US2266658A (en)
FR (1)	FR844373A (en)
GB (4)	GB509235A (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2923900A (en) *		1960-02-02		Poschenrieder
US3349347A (en) *		1967-10-24		Sauerland electric wave filter
US2421026A (en) *	1943-07-08	1947-05-27	Bell Telephone Labor Inc	Delay device
US2524781A (en) *	1945-06-18	1950-10-10	Standard Telephones Cables Ltd	Filter
US2533802A (en) *	1945-07-20	1950-12-12	Cornell Dubilier Electric	Selective amplifier
US2528365A (en) *	1947-07-01	1950-10-31	Crosley Broadcasting Corp	Automatic frequency control
US2575047A (en) *	1948-07-14	1951-11-13	Murray G Crosby	Exalted carrier receiver
US2579996A (en) *	1949-07-28	1951-12-25	Rca Corp	Frequency selective signal amplifying system
US2859416A (en) *	1955-07-18	1958-11-04	Motorola Inc	Filter
US2913682A (en) *	1956-07-02	1959-11-17	Hermes Electronics Co	Hybrid type filter networks
US2959752A (en) *	1959-03-25	1960-11-08	Hycon Eastern Inc	Selective low distortion crystal filter
US3170120A (en) *	1960-09-23	1965-02-16	Garold K Jensen	Active comb filter
BE621743A (en) *	1961-08-29
US3416104A (en) *	1965-05-05	1968-12-10	Filtech Corp	Band-pass crystal filters
US3483473A (en) *	1966-04-04	1969-12-09	Motorola Inc	Frequency converting and selecting system including mixer circuit with field effect transistor coupled to band-pass filter through impedance inverting circuit
US3505617A (en) *	1968-02-12	1970-04-07	Us Navy	Ripple reduction in a half-lattice crystal filter using three paralleled crystals resonant at lower,center and upper edge of pass-band
US3510794A (en) *	1968-03-21	1970-05-05	Philamon Lab Inc	Multiple tuning fork resonator filter with feedback
US3739286A (en) *	1971-07-06	1973-06-12	J Arnold	Crystal filter with temperature compensation
US3783418A (en) *	1973-01-04	1974-01-01	Johnson Electronics Inc	Crystal filtering device
DE3006692C2 (en) *	1980-02-22	1983-04-21	Wandel & Goltermann Gmbh & Co, 7412 Eningen	Quartz bandpass filter in which the non-linearity of the loss resistance of quartz resonators is taken into account
US4554678A (en) *	1982-12-13	1985-11-19	Honeywell Inc.	Wireless receiver having crystal filter at outputs of preamplifier

1937
- 1937-10-06 GB GB12014/39A patent/GB509235A/en not_active Expired
- 1937-10-06 GB GB27130/37A patent/GB509040A/en not_active Expired
1938
- 1938-05-09 GB GB13848/38A patent/GB515739A/en not_active Expired
- 1938-06-08 GB GB17082/38A patent/GB515640A/en not_active Expired
- 1938-09-28 US US232194A patent/US2266658A/en not_active Expired - Lifetime
- 1938-10-06 FR FR844373D patent/FR844373A/en not_active Expired

Also Published As

Publication number	Publication date
FR844373A (en)	1939-07-24
GB515739A (en)	1939-12-13
GB509235A (en)	1939-07-06
GB515640A (en)	1939-12-11
US2266658A (en)	1941-12-16

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