US3833399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of fluorescent lamp bulbs and other glass objects
Assignee: General Electric Co
•
Filing: 1972-07-17
•
Granted: 1974-09-03
•
Expires: 1992-07-17
Abstract
Abstract A solution of aluminum-s-butoxide combined with either or both of tetrabutyl titanate and tributyl antimony is applied to the surface of a glass lamp bulb or other glass object, and heated to about 400*C or higher. Such treatment on the exterior of a bulb hardens and strengthens the glass surface. When the treatment is applied to the interior of a bulb, the treated surface acts as a barrier to alkali materials in the glass, and also hardens and strengthens the bulb. Preferably, a sufficient amount of the aluminum-s-butyoxide is used so that the reaction produces some aluminum oxide which functions as a getter for water vapor and oxygen in the bulb.
Inventors
- 👤 W Martyn
- 👤 R Olwert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:12
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/11
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
A method as claimed in claim 1, in which said temperature is approximately 600*C.
Claim 2
Dependent Claim
27 words
A method as claimed in claim 1, in which the amount of aluminum-s-butoxide in said mixture is approximately twice that of said other materials in the mixture.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1, in which an ethyl cellulose binder is combined with said mixture to prevent hydrolysis of the mixture materials prior to said step of heating.
Claim 4
Independent Claim
85 words
A method of treating a glass bulb for an electrical device, comprising the steps of applying to at least one of the inner and outer surfaces of the bulb a mixture of aluminum-s-butoxide and a material selected from the group consisting of tetrabutyl titanate and tributyl antimony and a mixture thereof, and heating said bulb and mixture to a temperature of at least 400*C the amount of aluminum-s-butoxide in said mixture being sufficient to cause aluminum oxide to be produced during said step of heating.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 5, in which said temperature is approximately 600*C.
Claim 6
Dependent Claim
24 words
A method as claimed in claim 5, in which said amount of aluminum-s-butoxide is approximately twice that of said other materials in the mixture.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5, in which an ethyl cellulose binder is combined with said mixture to prevent hydrolysis of the mixture materials prior to said step of heating.
Claim 8
Dependent Claim
62 words
A method as claimed in claim 5, in which said bulb is a fluorescent lamp bulb, and including the step of applying a phosphor coating inside said bulb after applying said mixture to the inside of the bulb and prior to said heating, whereby said heating causes a chemical reaction to said mixture with the glass bulb and also lehrs the phosphor.
Claim 9
Dependent Claim
22 words
A method as claimed in claim 9, in which butanol is combined with said mixture to facilitate the adherence of said phosphor.
Claim 10
Dependent Claim
31 words
A method as claimed in claim 9, in which an ethyl cellulose binder is combined with said mixture to prevent hydrolysis of the mixture materials prior to said step of heating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |