FR743225A - - Google Patents
Info
- Publication number
- FR743225A FR743225A FR743225DA FR743225A FR 743225 A FR743225 A FR 743225A FR 743225D A FR743225D A FR 743225DA FR 743225 A FR743225 A FR 743225A
- Authority
- FR
- France
- 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
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL400388X | 1931-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR743225A true FR743225A (en) | 1933-03-25 |
Family
ID=19785886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR743225D Expired FR743225A (en) | 1931-12-24 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1919933A (en) |
| DE (1) | DE604600C (en) |
| FR (1) | FR743225A (en) |
| GB (1) | GB400388A (en) |
| NL (1) | NL38459C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2687471A (en) * | 1948-05-01 | 1954-08-24 | Western Union Telegraph Co | Concentrated arc discharge device |
| DE1022322B (en) * | 1953-07-31 | 1958-01-09 | Gen Electric Co Ltd | Electric sodium vapor discharge lamp |
-
0
- NL NL38459D patent/NL38459C/xx active
- FR FR743225D patent/FR743225A/fr not_active Expired
-
1932
- 1932-08-03 DE DEN34040D patent/DE604600C/en not_active Expired
- 1932-08-19 GB GB23327/32A patent/GB400388A/en not_active Expired
-
1933
- 1933-01-12 US US651385A patent/US1919933A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| NL38459C (en) | |
| GB400388A (en) | 1933-10-26 |
| DE604600C (en) | 1934-10-24 |
| US1919933A (en) | 1933-07-25 |