US3628846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a vapor discharge lamp
Assignee: Duro Test Corp
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Filing: 1970-03-01
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Granted: 1971-12-21
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Expires: 1990-03-01
Abstract
Abstract A metal vapor discharge lamp and method of making the same in which the lamp comprises a partially evacuated translucent ceramic tube containing a charge of metal and a starter gas and hermetically sealed at either end by means of a suitable end cap and electrode assembly which does not have an exhaust tubulation. According to the method of manufacture the evacuation of impurities and residual gases from the lamp and the introduction of the starter gas into the lamp is carried out in the same environment as the sealing of the end cap and electrode assemblies to the ends of the translucent ceramic tube.
Inventors
- 👤 Salvatore Cortorillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:30
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395; H01J61/00; H01J61/02; H01J61/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
The method of making a metal vapor discharge lamp comprising the steps of disposing a translucent tubular envelope within an evacuated gastight chamber; securing a first end cap and electrode assembly to one end of said envelope to form a gastight seal; inserting a charge of metal into said envelope through an opening in a second end cap and electrode assembly to provide a source of metal vapor for the operation of said lamp; introducing a starter gas into said envelope; thereafter heating to secure said second end cap and electrode assembly to the other end of said envelope and to form said seal opening and thereby form a gastight seal; and removing the assembled lamp from said gastight chamber.
Claim 2
Independent Claim
120 words
The method of making a metal vapor discharge lamp comprising the steps of disposing a translucent tubular envelope within an evacuated gastight chamber; securing a first end cap and electrode assembly to one end of said envelope to form a gastight seal; inserting a charge of metal into said envelope through an opening in a second end cap and electrode assembly to provide a source of metal vapor for the operation of said lamp; introducing a starter gas into said envelope; thereafter heating to secure said second end cap and electrode assembly to the other end of said envelope and to form said seal opening and thereby form a gastight seal; and removing the assembled lamp from said gastight chamber.
Claim 3
Dependent Claim
16 words
The method of claim 1, further comprising the step of heating the envelope to outgas it.
Claim 4
Dependent Claim
22 words
The method of claim 2, wherein said outgassing step is carried out prior to securing the first end cap to the envelope.
Claim 5
Independent Claim
23 words
The method of claims 2, wherein the outgassing step is also carried out prior to securing the second end cap to the envelope.
Claim 6
Dependent Claim
48 words
The method of claim 1, wherein the end caps and electrode assemblies are sealed to the envelope by providing frit between the end caps and the ends of the envelopes and further comprising the step of heating the frit to cause it to flow to form the seal.
Claim 7
Dependent Claim
86 words
The method of claim 1, wherein the first end cap is sealed to the envelope by providing frit between the first end cap and one end of the envelope and the heating of the envelope and the first end cap is carried out to a first temperature to drive off impurities and outgas the envelope, and then the heating of the envelope and first end cap is carried out to a second and higher temperature to cause the frit to flow and form a gastight seal.
Claim 8
Dependent Claim
80 words
The method of claim 6, wherein the second end cap is sealed to the envelope by providing frit between the second end cap and the other end of the envelope and the heating is carried out to a first temperature to drive off impurities and outgas the envelope, and then the heating of the envelope and the second end cap is carried out to a second and higher temperature to cause the frit to flow and form a gastight seal.
Claim 9
Dependent Claim
19 words
The of claim 6, wherein said first temperature is in the range between about 600* C. and 1200* C.
Claim 10
Dependent Claim
36 words
The method of claim 1, further comprising the step of holding the first end cap and electrode assembly in heat-conductive relationship with a heat sink while the second end cap is being secured to the envelope.
References Cited (Backward Citations)
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US3088201A
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US3205395A
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US3211511A
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US3385463A
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US3363133A
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US3390296A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |