FR544381A - Dual Filament Incandescent Lamps - Google Patents
Dual Filament Incandescent LampsInfo
- Publication number
- FR544381A FR544381A FR544381DA FR544381A FR 544381 A FR544381 A FR 544381A FR 544381D A FR544381D A FR 544381DA FR 544381 A FR544381 A FR 544381A
- Authority
- FR
- France
- Prior art keywords
- incandescent lamps
- filament incandescent
- dual filament
- dual
- lamps
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K9/00—Lamps having two or more incandescent bodies separately heated
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US492887A US1722180A (en) | 1921-08-17 | 1921-08-17 | Two-filament incandescent lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
FR544381A true FR544381A (en) | 1922-09-21 |
Family
ID=23958005
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR544381D Expired FR544381A (en) | 1921-08-17 | 1921-12-09 | Dual Filament Incandescent Lamps |
FR26911D Expired FR26911E (en) | 1921-08-17 | 1922-09-30 | Dual Filament Incandescent Lamps |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR26911D Expired FR26911E (en) | 1921-08-17 | 1922-09-30 | Dual Filament Incandescent Lamps |
Country Status (2)
Country | Link |
---|---|
US (1) | US1722180A (en) |
FR (2) | FR544381A (en) |
-
1921
- 1921-08-17 US US492887A patent/US1722180A/en not_active Expired - Lifetime
- 1921-12-09 FR FR544381D patent/FR544381A/en not_active Expired
-
1922
- 1922-09-30 FR FR26911D patent/FR26911E/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR26911E (en) | 1924-03-20 |
US1722180A (en) | 1929-07-23 |
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