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US4576833A
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US
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Method of forming a luminescent layer on a carrier and low-pressure mercury vapor discharge lamp having a layer applied to a carrier by means of such a method
Assignee: US Philips Corp
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Filing: 1984-10-22
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Granted: 1986-03-18
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Expires: 2004-10-22
Abstract
Abstract A method of forming a luminescent layer on a glass carrier (such as the wall of a discharge vessel of a low-pressure mercury vapor discharge lamp) from a suspension of grains of a luminescent material and a quantity of binder in a suspension medium. According to the invention, the suspension medium preferably consists of water and the binder mainly comprises fibrous crystals of boehmite.
Inventors
- 👤 Pieter C. Scholten
- 👤 Ronald K. Eijnthoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:31
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A method of forming a layer of luminescent material on a glass carrier from a suspension of grains of luminescent material in a colloidal solution of a binder in a suspension medium, which suspension is contacted with the carrier in such a manner that a layer of suspension adheres thereto, the non-adherent residue of suspension is removed and the layer adhered to the carrier is dried, characterized in that the binder mainly comprises fibrous boehmite crystals up to at most 7% by weight measured with respect to the quantity of luminescent material present in the suspension.
Claim 2
Independent Claim
96 words
A method of forming a layer of luminescent material on a glass carrier from a suspension of grains of luminescent material in a colloidal solution of a binder in a suspension medium, which suspension is contacted with the carrier in such a manner that a layer of suspension adheres thereto, the non-adherent residue of suspension is removed and the layer adhered to the carrier is dried, characterized in that the binder mainly comprises fibrous boehmite crystals up to at most 7% by weight measured with respect to the quantity of luminescent material present in the suspension.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1, characterized in that the suspension medium consists mainly of water.
Claim 4
Dependent Claim
24 words
A low-pressure mercury vapour discharge lamp comprising a discharge vessel provided with a luminescent layer by means of the method claimed in claim 1.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |