FR687240A - Improvements in photoelectric devices - Google Patents

Improvements in photoelectric devices

Info

Publication number
FR687240A
FR687240A FR687240DA FR687240A FR 687240 A FR687240 A FR 687240A FR 687240D A FR687240D A FR 687240DA FR 687240 A FR687240 A FR 687240A
Authority
FR
France
Prior art keywords
photoelectric devices
photoelectric
devices
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR687240A publication Critical patent/FR687240A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
    • H01J40/02—Details
    • H01J40/04—Electrodes
FR687240D 1928-12-27 1929-12-26 Improvements in photoelectric devices Expired FR687240A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US687240XA 1928-12-27 1928-12-27

Publications (1)

Publication Number Publication Date
FR687240A true FR687240A (en) 1930-08-06

Family

ID=22084312

Family Applications (1)

Application Number Title Priority Date Filing Date
FR687240D Expired FR687240A (en) 1928-12-27 1929-12-26 Improvements in photoelectric devices

Country Status (1)

Country Link
FR (1) FR687240A (en)

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