US3845343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inside bulb coating for ultraviolet lamp
Assignee: General Electric Co
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Filing: 1973-05-02
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Granted: 1974-10-29
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Expires: 1993-05-02
Abstract
Abstract A transparent layer of aluminum oxide is provided on the inside surface of the glass bulb of a gas discharge ultraviolet germicidal lamp. This results in improved starting, particularly under low line voltage conditions, and reduced bulb discoloration during the operating life of the lamp. To make the transparent layer, a coating is applied to the bulb, preferably in the form of aluminum S butoxide, combined with other chemicals to retard premature hydrolysis and/or gelling. After air drying, the coated bulb is lehred to produce the final coating of aluminum oxide.
Inventors
- 👤 E Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:43
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A GAS DISCHARGE ULTRAVIOLET LAMP COMPRISING A BULT OF SUBSTANTIALLY SODIUM-FREE ULTRAVIOLET-TRANSMITTING GLASS AND CONTAINING MERCURY VAPOR AT LOW PRESSURE WHEREIN THE IMPROVOEMENT COMPRISES A LAYER OF NON-PARTICLATE ALUMINUM OXIDE (AL2O3) ON THE INNER SURFACE OF THE BULB.
Claim 2
Dependent Claim
38 words
A GAS DISCHARGE ULTRAVIOLET LAMP COMPRISING A BULT OF SUBSTANTIALLY SODIUM-FREE ULTRAVIOLET-TRANSMITTING GLASS AND CONTAINING MERCURY VAPOR AT LOW PRESSURE WHEREIN THE IMPROVOEMENT COMPRISES A LAYER OF NON-PARTICLATE ALUMINUM OXIDE (AL2O3) ON THE INNER SURFACE OF THE BULB.
Claim 3
Dependent Claim
27 words
A lamp as claimed in claim 1 in which said layer of aluminum oxide is a non-particulate continuous film having a thickness between 0.1 and 1.0 microns.
Claim 4
Dependent Claim
17 words
A lamp as claimed in claim 2 in which said thickness is between 0.2 and 0.5 microns.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |