US3738729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of tungsten halogen lamps
Assignee: EMI Group Ltd
•
Filing: 1971-08-10
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Granted: 1973-06-12
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Expires: 1991-08-10
Abstract
Abstract A method of making a tungsten halogen incandescent lamp in which iodine is introduced into the lamp envelope in the form of an iodide or hydroiodide of an element of Group IV of the Periodic Table which is an involatile solid at room temperature.
Inventors
- 👤 G Coxon
- 👤 J Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:13
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; H01K3/00; H01K3/22; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
44 words
A method according to claim 1 which includes the steps of introducing said iodine compound into said envelope in solution in a volatile non-polar organic liquid, and thereafter removing said liquid from said envelope thereby to leave said solid iodine compound in said envelope.
Claim 2
Dependent Claim
22 words
A method according to claim 1 wherein said iodine compound is selected from the group consisting of CHI3, CI4, GeI4 or SiI4.
Claim 3
Dependent Claim
22 words
A method according to claim 2 wherein said iodine compound is selected from the group consisting of CHI3, CI4, GeI4 or SiI4.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |