US4698239A
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: 1986-09-29
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Granted: 1987-10-06
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Expires: 2006-09-29
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 04:51
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35; H01J9/00; H01J9/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
42 words
The method of making a fluorescent lamp having improved spectral output and maintenance which comprises the steps of: coating a tubular glass envelope with a phosphor; and applying over said phosphor a film consisting of yttrium oxide and at least one activator.
Claim 2
Independent Claim
42 words
The method of making a fluorescent lamp having improved spectral output and maintenance which comprises the steps of: coating a tubular glass envelope with a phosphor; and applying over said phosphor a film consisting of yttrium oxide and at least one activator.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein said film is deposited by electron beam vaporization of a target consisting of yttrium oxide and at least one activator and subsequent deposition of the vapor so generated upon said phosphor.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein said film is deposited to a thickness of from about 0.2 microns to about 1.5 microns.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein said film is deposited to a thickness of about one micron.
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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |