Patent US3911313A successfully refreshed from Google Patents.
US3911313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for arc discharge lamp
Assignee: GTE Sylvania Inc
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Filing: 1974-05-17
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Granted: 1975-10-07
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Expires: 1994-05-17
Abstract
Abstract An electrode for a high pressure sodium arc discharge lamp comprises a refractory metal tube, a portion of which contains electron emissive material. The ends of said portion are crimped to provide a container for the electron emissive material.
Inventors
- 👤 Jr Francis B Makar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:02
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0732; A; A61; A61P; A61P25/00; A61P25/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A HIGH PRESSURE SODIUM LAMP ELECTRODE COMPRISING A LENGTH OF NIOBIUM TUBING, A PORTION OF SAID LENGTH FORMING AN ENCLOSURE WHICH CONTAINS ELECTRON EMISSIVE MATERIAL, A TUNGSTEN ROD EXTENDING OUT OF SAID ENCLOSURE AND PROJECTING SLIGHTLY BEYOND SAID LENGTH OF NIOBIUM TUBING, THE INTERIOR OF SAID TUBING BEING HERMETICALLY SEALED AT A SECTION THEREOF INTERMEDIATE THE ENDS OF THE TUBING.
Claim 2
Dependent Claim
60 words
A HIGH PRESSURE SODIUM LAMP ELECTRODE COMPRISING A LENGTH OF NIOBIUM TUBING, A PORTION OF SAID LENGTH FORMING AN ENCLOSURE WHICH CONTAINS ELECTRON EMISSIVE MATERIAL, A TUNGSTEN ROD EXTENDING OUT OF SAID ENCLOSURE AND PROJECTING SLIGHTLY BEYOND SAID LENGTH OF NIOBIUM TUBING, THE INTERIOR OF SAID TUBING BEING HERMETICALLY SEALED AT A SECTION THEREOF INTERMEDIATE THE ENDS OF THE TUBING.
Claim 3
Dependent Claim
18 words
The electrode of claim 1 wherein the ends of said enclosure comprise crimped portions of the niobium tubing.
Claim 4
Dependent Claim
18 words
The electrode of claim 2 wherein said tungsten rod is fastened within said tubing by said crimped portions.
Claim 5
Independent Claim
117 words
The method of making a high pressure sodium lamp electrode comprising the steps of: inserting a tungsten rod into a length of niobium tubing so that only a small portion of the tungsten rod axially extends beyond the tubing; crimping an intermediate portion of the niobium tubing into the inner end of the tungsten rod; hermetically sealing the interior of the niobium tubing at about the crimped section thereof; placing electron emissive material within the niobium tubing adjacent the crimped section and within the portion of the niobium tubing that contains the tungsten rod; and crimping the niobium tubing onto the tungsten rod so as to form an enclosure within which is contained the electron emissive material.
Claim 6
Independent Claim
117 words
The method of making a high pressure sodium lamp electrode comprising the steps of: inserting a tungsten rod into a length of niobium tubing so that only a small portion of the tungsten rod axially extends beyond the tubing; crimping an intermediate portion of the niobium tubing into the inner end of the tungsten rod; hermetically sealing the interior of the niobium tubing at about the crimped section thereof; placing electron emissive material within the niobium tubing adjacent the crimped section and within the portion of the niobium tubing that contains the tungsten rod; and crimping the niobium tubing onto the tungsten rod so as to form an enclosure within which is contained the electron emissive material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |