FR646683A - Loud speaker - Google Patents

Loud speaker

Info

Publication number: FR646683A
Authority: FR; France
Prior art keywords: loud speaker; loud; speaker
Prior art date: 1927-01-07
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

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.)

HOPKINS CORP

Original Assignee

HOPKINS CORP

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.)

1927-01-07

Filing date

1928-01-03

Publication date

1928-11-14

1928-01-03 Application filed by HOPKINS CORP filed Critical HOPKINS CORP

1928-11-14 Application granted granted Critical

1928-11-14 Publication of FR646683A publication Critical patent/FR646683A/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones

Landscapes

Engineering & Computer Science (AREA)
Multimedia (AREA)
Physics & Mathematics (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Diaphragms For Electromechanical Transducers (AREA)

FR646683D 1927-01-07 1928-01-03 Loud speaker Expired FR646683A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US159553A US1763053A (en)	1927-01-07	1927-01-07	Loud-speaker

Publications (1)

Publication Number	Publication Date
FR646683A true FR646683A (en)	1928-11-14

Family

ID=22573030

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR646683D Expired FR646683A (en)	1927-01-07	1928-01-03	Loud speaker

Country Status (3)

Country	Link
US (1)	US1763053A (en)
FR (1)	FR646683A (en)
GB (1)	GB283210A (en)

1927
- 1927-01-07 US US159553A patent/US1763053A/en not_active Expired - Lifetime
1928
- 1928-01-02 GB GB31/28A patent/GB283210A/en not_active Expired
- 1928-01-03 FR FR646683D patent/FR646683A/en not_active Expired

Also Published As

Publication number	Publication date
GB283210A (en)	1928-06-28
US1763053A (en)	1930-06-10

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