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US4148935A
Expired / Lapsed
US
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Method of making fluorescent lamp
Assignee: GTE Sylvania Inc
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Filing: 1977-11-30
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Granted: 1979-04-10
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Expires: 1997-11-30
Abstract
Abstract A coating is deposited on the inner wall of a fluorescent lamp bulb from a suspension of particulate matter in a liquid vehicle of polyoxyethylene, hydroxyethylmethyl cellulose and an insolubilizing agent dissolved in water. After drying and low temperature heating to insolubilize the coating, another coating is deposited thereover from a similar aqueous vehicle.
Inventors
- 👤 Willy P. Schreurs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:53
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: 6
Claim 1
Independent Claim
111 words
In the manufacture of a fluorescent lamp, the steps which comprise: depositing on the inner bulb wall of a fluorescent lamp a first particulate coating from a suspension the liquid vehicle of which comprises polyoxyethylene, hydroxyethylmethyl cellulose and an insolubilizing agent all dissolved in water; drying the coating and then heating it at a low temperature sufficient to insolubilize the coating but insufficient to burn out the organic matter therefrom; depositing on the first particulate coating a second particulate coating from a suspension the liquid vehicle of which comprises polyoxyethylene and hydroxyethylmethyl cellulose dissolved in water; drying the coating; lehring the bulb; and processing the bulb into a finished fluorescent lamp.
Claim 2
Dependent Claim
111 words
In the manufacture of a fluorescent lamp, the steps which comprise: depositing on the inner bulb wall of a fluorescent lamp a first particulate coating from a suspension the liquid vehicle of which comprises polyoxyethylene, hydroxyethylmethyl cellulose and an insolubilizing agent all dissolved in water; drying the coating and then heating it at a low temperature sufficient to insolubilize the coating but insufficient to burn out the organic matter therefrom; depositing on the first particulate coating a second particulate coating from a suspension the liquid vehicle of which comprises polyoxyethylene and hydroxyethylmethyl cellulose dissolved in water; drying the coating; lehring the bulb; and processing the bulb into a finished fluorescent lamp.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the insolubilizing agent is glyoxal.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein the first particulate coating contains aluminum oxide and the second particulate coating contains a phosphor material.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein the weight ratio of glyoxal to hydroxyethylmethyl cellulose in the liquid vehicle is about two or three to one.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the weight ratio of polyoxyethylene to hydroxyethylmethyl cellulose in the liquid vehicle is between 1/3 and 3/1.
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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |