US4633133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamps having improved lamp spectral output and maintenance and method of making same
Assignee: Osram Sylvania Inc
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Filing: 1984-11-13
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Granted: 1986-12-30
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Expires: 2004-11-13
Abstract
Abstract Lumen maintenance and spectral output of fluorescent lamps is improved by applying over the phosphor a vapor deposited film consisting of yttrium oxide and at least one activator. The vapor is generated by electron beam bombardment of the activated yttrium oxide target and the film is most efficacious when applied to a thickness of from about 0.2 microns to about 1.5 microns.
Inventors
- 👤 John M. Flaherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:00
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35; H01J9/00; H01J9/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A fluorescent lamp comprising: a tubular, hermetically sealed, glass envelope; electrodes sealed in the ends of said envelope; an arc generating and sustaining medium including mercury within said envelope; a phosphor coating adhering to the interior surface of said envelope; and a spectral output and maintenance improving non-particulate film overlying said phosphor wherein said film consists of yttrium oxide and at least one activator.
Claim 2
Dependent Claim
64 words
A fluorescent lamp comprising: a tubular, hermetically sealed, glass envelope; electrodes sealed in the ends of said envelope; an arc generating and sustaining medium including mercury within said envelope; a phosphor coating adhering to the interior surface of said envelope; and a spectral output and maintenance improving non-particulate film overlying said phosphor wherein said film consists of yttrium oxide and at least one activator.
Claim 3
Dependent Claim
16 words
The lamp of claim 1 wherein said activator is selected from the group of rare-earth elements.
Claim 4
Dependent Claim
10 words
The lamp of claim 2 wherein said activator is europium.
Claim 5
Dependent Claim
20 words
The lamp of claim 1 wherein said film has a thickness of from about 0.2 microns to about 1.5 microns.
Claim 6
Dependent Claim
15 words
The lamp of claim 4 wherein said film has a thickness of about one micron.
Claim 7
Dependent Claim
13 words
The lamp of claim 1 wherein said phosphor is manganese activated zinc orthosilicate.
References Cited (Backward Citations)
JPS56112064A
Cited
US4459507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |