公开(公告)号：US3619712A

公开(公告)日：1971-11-09

申请号：US3619712D

申请日：1969-10-22

Applicant: DURO TEST CORP

Inventor： KOO RONALD C ,  SHURGAN JOEL

IPC: H01K1/62 ,  H01J7/44 ,  H05B39/00

CPC classification number: H01K1/62

Abstract: Incandescent lamps connected in circuits to keep a maintenance current flowing through the lamp filament when the lamp is off to improve the ductile-brittle properties of the filament. Lamps are also disclosed which have an internal impedance element to be used in the circuits for producing the maintenance current.

公开(公告)号：US3927989A

公开(公告)日：1975-12-23

申请号：US32824673

申请日：1973-01-31

Applicant: DURO TEST CORP

Inventor： KOO RONALD C

IPC: C22C32/00 ,  H01K3/02 ,  B22F1/00 ,  B22F5/00

CPC classification number: C22C32/00 ,  H01K3/02

Abstract: Tungsten filaments for lamps and methods of making the same in which a second phase material is dispersed in doped tungsten filament material to pair with bubbles produced by the dopant which are used to make the filament resistant to sag. The second phase material reduces migration of bubbles to hot spots on the operating filament and also retards bubble coalescence into groups. In a preferred embodiment of the invention, the second phase material additive is introduced in elemental form and the filament is heated in a nitrogen atmosphere to form a nitride of the additive.

Abstract translation: 用于灯的钨丝及其制造方法，其中将第二相材料分散在掺杂的钨丝材料中以与由用于使灯丝耐下垂的掺杂剂产生的气泡配对。 第二相材料减少气泡在操作丝上的热点迁移，并且还将气泡聚结阻滞成组。 在本发明的优选实施方案中，第二相材料添加剂以元素形式引入，并且在氮气气氛中加热细丝以形成添加剂的氮化物。

公开(公告)号：US3662789A

公开(公告)日：1972-05-16

申请号：US3662789D

申请日：1970-08-24

Applicant: DURO TEST CORP

Inventor： KOO RONALD C ,  SHURGAN JOEL

IPC: B21F3/04 ,  H01K3/02 ,  B21F45/00

CPC classification number: B21F3/04 ,  H01K3/02

Abstract: A mandrel and a method for manufacturing filament coils for electric lamps. The mandrel is coated with a material, such as copper, which does not alloy with the filament coil during annealing. The coil is wound on the coated mandrel and the mandrel is dissolved after the filament is annealed.

Abstract translation: 一种心轴及其制造用于电灯的线圈的方法。 心轴在退火期间用诸如铜的材料涂覆，其不与丝线圈合金。 线圈被缠绕在涂覆的心轴上，并且心丝在丝退火之后溶解。

公开(公告)号：US3877495A

公开(公告)日：1975-04-15

申请号：US44748174

申请日：1974-03-04

Applicant: DURO TEST CORP

Inventor： KOO RONALD C ,  SHURGAN JOEL

IPC: B21F3/04 ,  H01K1/08 ,  H01K3/02

CPC classification number: H01K3/02 ,  B21F3/04 ,  H01K1/08 ,  Y10T29/49812

Abstract: A method for manufacturing an annealed tungsten filament wire for electric lamps with a reduced amount of impurities in which the filament wire is wound on a mandrel, either the wire or the mandrel is coated with a protective material, the wire is annealed at an elevated temperature, and the wire is removed from the mandrel.

Abstract translation: 一种用于制造退火钨丝线的方法，其中将丝线卷绕在心轴上的杂质数量减少的电灯，线或心轴涂覆有保护材料，线材在高温下退火 并且将线从心轴移除。