Statements (14)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:US_patent
|
| gptkbp:assignee |
gptkb:Thomas_A._Edison
|
| gptkbp:country |
gptkb:United_States
|
| gptkbp:date |
1884-03-25
|
| gptkbp:fieldOfInvention |
electric lighting
|
| gptkbp:filingDate |
1879-11-04
|
| gptkbp:inventedBy |
gptkb:Thomas_A._Edison
|
| gptkbp:requires |
an improved electric lamp with a carbon filament
|
| gptkbp:status |
expired
|
| gptkbp:title |
Improvement in Electric Lamps
|
| gptkbp:type |
utility patent
|
| gptkbp:bfsParent |
gptkb:US_Patent_3,733,309
|
| gptkbp:bfsLayer |
8
|
| https://www.w3.org/2000/01/rdf-schema#label |
US 295,719
|