US3843899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-bromine cycle incandescent lamp containing boron
Assignee: US Philips Corp
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Filing: 1973-05-07
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Granted: 1974-10-22
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Expires: 1993-05-07
Abstract
Abstract A tungsten bromine cycle lamp comprising boron in a solid state or as a gaseous or volatile compound. The boron serves to keep the lamp wall clear for the lifetime of the bulb.
Inventors
- 👤 G Jampens
- 👤 G Prakken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
AN ELECTRIC INCANDESCENT LAMP HAVING A FILAMENT BODY OF TUNGSTEN AN ENVELOPE HAVING A WALL CONTOURED WITH RESPECT TO SAID FILAMENT BODY TO MAINTAIN SAID WALL AT A TEMPERATURE AT WHICH TUNGSTEN-BROMINE COMPOUNDS ARE VOLATILE A GAS FOR SAID ENVELOPE COMPRISING BROMINE AND HYDROGEN WHICH ARE INTRODUCED INTO THE LAMP IN PROPORTIONS BETWEEN HYDROGEN AND BROMINE OF 1 OR MORE, AND A QUANTITY OF GRAM ATOMS OF BORON IN THE GAS ATMOSPHERE IN THE ENVELOPE, SAID QUANTITY BEING LESS THAN 10 PERCENT OF THE GRAM ATOMS OF BROMINE IN THE LAMP AND AT LEAST EQUAL TO THE QUANTITY WHICH CORRESPONDS TO THE VAPOR PRESSURE ABOVE SOLID BORON AT A TEMPERATURE OF 200* C.
Claim 2
Dependent Claim
113 words
AN ELECTRIC INCANDESCENT LAMP HAVING A FILAMENT BODY OF TUNGSTEN AN ENVELOPE HAVING A WALL CONTOURED WITH RESPECT TO SAID FILAMENT BODY TO MAINTAIN SAID WALL AT A TEMPERATURE AT WHICH TUNGSTEN-BROMINE COMPOUNDS ARE VOLATILE A GAS FOR SAID ENVELOPE COMPRISING BROMINE AND HYDROGEN WHICH ARE INTRODUCED INTO THE LAMP IN PROPORTIONS BETWEEN HYDROGEN AND BROMINE OF 1 OR MORE, AND A QUANTITY OF GRAM ATOMS OF BORON IN THE GAS ATMOSPHERE IN THE ENVELOPE, SAID QUANTITY BEING LESS THAN 10 PERCENT OF THE GRAM ATOMS OF BROMINE IN THE LAMP AND AT LEAST EQUAL TO THE QUANTITY WHICH CORRESPONDS TO THE VAPOR PRESSURE ABOVE SOLID BORON AT A TEMPERATURE OF 200* C.
Claim 3
Dependent Claim
91 words
An electric incandescent lamp having a filament body of tungsten an envelope having a wall contoured with respect to said filament body to maintain said wall at a temperature at which tungsten-bromine compounds are volatile, and a filling for said envelope comprising bromine and hydrogen which are introduced into the lamp in proportions between hydrogen and bromine of 1 or more and a quantity of solid boron disposed within said envelope at an area where the temperature of boron during continuous operation of the lamp is between 200* and 500* C.
Claim 4
Dependent Claim
91 words
An electric incandescent lamp having a filament body of tungsten an envelope having a wall contoured with respect to said filament body to maintain said wall at a temperature at which tungsten-bromine compounds are volatile, and a filling for said envelope comprising bromine and hydrogen which are introduced into the lamp in proportions between hydrogen and bromine of 1 or more and a quantity of solid boron disposed within said envelope at an area where the temperature of boron during continuous operation of the lamp is between 200* and 500* C.
Claim 5
Dependent Claim
70 words
An electric incandescent lamp having a filament body of tungsten an envelope having a wall contoured with respect to said filament body to maintain said wall at a temperature at which tungsten-bromine compounds are volatile, and a filling for said envelope comprising bromine and hydrogen which are introduced into the lamp in proportions between hydrogen and bromine of 1 or more, and between 10 and 100 micrograms of solid boron.
Claim 6
Dependent Claim
70 words
An electric incandescent lamp having a filament body of tungsten an envelope having a wall contoured with respect to said filament body to maintain said wall at a temperature at which tungsten-bromine compounds are volatile, and a filling for said envelope comprising bromine and hydrogen which are introduced into the lamp in proportions between hydrogen and bromine of 1 or more, and between 10 and 100 micrograms of solid boron.
Claim 7
Dependent Claim
89 words
An electric incandescent lamp having a filament body of tungsten and envelope having a wall contoured with respect to said filament body to maintain said wall at a temperature at which tungsten-bromine compounds are volatile, and a filling for said envelope comprising bromine and hydrogen which are introduced into the lamp in proportions between hydrogen and bromine of 1 or more and a gram atom quantity of boron in the form of a gaseous compound is greater than 0.1 percent of the gram atoms of bromine in the lamp.
Claim 8
Dependent Claim
89 words
An electric incandescent lamp having a filament body of tungsten and envelope having a wall contoured with respect to said filament body to maintain said wall at a temperature at which tungsten-bromine compounds are volatile, and a filling for said envelope comprising bromine and hydrogen which are introduced into the lamp in proportions between hydrogen and bromine of 1 or more and a gram atom quantity of boron in the form of a gaseous compound is greater than 0.1 percent of the gram atoms of bromine in the lamp.
References Cited (Backward Citations)
US3586896A
Cited
US3582703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |