Patent US3794403A successfully refreshed from Google Patents.
US3794403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for introducing a substance into a discharge tube or electric lamp
Assignee: Wolf R V D
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Filing: 1972-07-10
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Granted: 1974-02-26
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Expires: 1992-07-10
Abstract
Abstract A method of manufacturing an electric discharge tube or an electric lamp starting from a vessel wherein a closed holder is placed which is provided with a quantity of one or more substances to be introduced into the vessel. Subsequently, a desired gas atmosphere is brought about in the vessel and the vessel is closed. Finally the holder is opened by means of current passage through a heating element present in the vessel. The heating element is connected to the ends of an electric conductor placed in the vessel, for example, a coil, between which ends an electric voltage difference is profuced by means of induction with the aid of a current-conveying primary coil placed outside the vessel.
Inventors
- 👤 J Ridders
- 👤 Der Wolf R Van
- 👤 A Mollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:31
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A lamp vessel adapted for having a desired gaseous material introduced into said vessel after said vessel is closed comprising: a closed lamp envelope; at least one electrode mounted within the envelope; a resilient metal strip within said envelope, said strip having first and second end portions which are spaced apart to avoid electrical contact; closed holding means including heat meltable walls containing preselected materials for release into the vessel; and a filamentary heating element having first and second ends and a central portion, said first end being affixed and electrically connected to said first end portion of said metal strip, said heating element central portion tightly extending over the holding means and clamping said holding means to said strip using the resilience of the strip, said second end of said heating element being affixed and electrically connected to said second end portion of said metal Strip, said metal strip and heating element forming a single closed turn for use as a secondary induction element, said heating element being adapted to melt and cut through the walls of the holding means to release said materials.
Claim 2
Dependent Claim
185 words
A lamp vessel adapted for having a desired gaseous material introduced into said vessel after said vessel is closed comprising: a closed lamp envelope; at least one electrode mounted within the envelope; a resilient metal strip within said envelope, said strip having first and second end portions which are spaced apart to avoid electrical contact; closed holding means including heat meltable walls containing preselected materials for release into the vessel; and a filamentary heating element having first and second ends and a central portion, said first end being affixed and electrically connected to said first end portion of said metal strip, said heating element central portion tightly extending over the holding means and clamping said holding means to said strip using the resilience of the strip, said second end of said heating element being affixed and electrically connected to said second end portion of said metal Strip, said metal strip and heating element forming a single closed turn for use as a secondary induction element, said heating element being adapted to melt and cut through the walls of the holding means to release said materials.
Claim 3
Dependent Claim
26 words
The vessel as claimed in claim 1, wherein said resilient metal strip is annular in shape and substantially surrounds said electrode as an anti-blackening guard strip.
Claim 4
Dependent Claim
67 words
In combination with the lamp vessel of claim 1, an arrangement for introducing gaseous material therein, also including a primary induction element whereby application of an AC voltage to said primary induction element induces a voltage in said secondary element sufficient to heat said heating element so as to cause the walls of said holding means to melt, thereby releasing said preselected materials within said closed vessel.
Claim 5
Dependent Claim
51 words
The lamp as described in claim 1 wherein said lamp is a low-pressure mercury vapor discharge lamp which includes a discharge space and two electrodes, the closed holder being of glass and containing a desired quantity of mercury subject to release by melting of the glass holder by said heating element.
Claim 6
Dependent Claim
16 words
The lamp of claim 1 wherein the heating element is a filament of molybdenum or tungsten.
Claim 7
Dependent Claim
16 words
The lamp of claim 1 wherein the heating element is a strip of chrome-iron or chrome-nickel.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |