US3793058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-diffusing clay coatings for lamps
Assignee: Corning Glass Works
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Filing: 1971-10-19
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Granted: 1974-02-19
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Expires: 1991-10-19
Abstract
Abstract This invention relates to abrasion-resistant, tightly bonded, light-diffusing clay coatings particularly suited for use with incandescent lamps. The plating properties of certain low-iron smectite clays, including, for example, alkali metal and certain modified alkaline earth metal montmorillonites, render them particularly suitable for use as vehicles in glass coating systems to assure even and uniform dispersement of other lightdiffusing and coloring agents. For lamp applications, the clay should have at least 25 percent of the exchange capacity thereof attributable to alkali metal ions and should contain less than about 1 percent by weight of iron.
Inventors
- 👤 D Rostoker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:54
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; H; H01; H01K; H01K1/00; H01K1/28; H01K1/32; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/229; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/114
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
A glass incandescent lamp envelope according to claim 1 wherein said dewatered film additionally contains additives selected from the group consisting of inorganic light-diffusing agents and inorganic coloring agents.
Claim 2
Dependent Claim
92 words
A glass incandescent lamp envelope according to claim 2 wherein said clay is a modified calcium montmorillonite clay which has about 30-40 percent of the exchange capacity thereof attributable to the presence of alkali metal ions in exchange positions and comprises about 3-7 parts by weight of said dewatered film, and wherein said dewatered film further contains at least one inorganic light-diffusing agent selected in the indicated proportion from the group consisting of 1/2-2 parts by weight of Ti02, 2-10 parts by weight of silica, and 1-4 parts by weight of wollastonite.
Claim 3
Dependent Claim
149 words
A process for applying a tightly-bonded, light-diffusing coating to at least a portion of the interior surface of a glass incandescent lamp envelope which comprises the steps of a. preparing a stable flowable aqueous slurry consisting essentially of water and a clay selected from the group consisting of modified alkaline earth montmorillonites containing not more than about 0.5 percent iron by weight and having about 25-50 percent of the exchange capacity thereof attributable to the presence of alkali metal ions in exchange positions; b. applying the slurry to the interior surface of a glass incandescent lamp envelope to form a coating thereon; c. drying the coating to remove adsorbed water; and d. heating the coating to a temperature in the range of about 600*-650* C. for a time at least sufficient to cause the clay to release its structural water and bond to the surface of the glass article.
Claim 4
Dependent Claim
53 words
A process according to claim 4 wherein the slurry additionally contains additives selected from the group consisting of inorganic light-diffusing agents and inorganic coloring agents. 6. A process according to claim 4 wherein the slurry additionally contains at least one inorganic light-diffusing agent selected from the group consisting of silica, titania, and wollastonite.
Claim 5
Dependent Claim
61 words
A process according to claim 6 wherein said clay is a modified calcium montmorillonite clay wherein said clay comprises up to about 7 percent by weight of the slurry, and wherein the inorganic light-diffusing agent is selected, in the indicated proportion by weight of the slurry, from the group consisting of 1/2-2 percent titania, 2-10 percent silica, and 1-4 percent wollastonite.
References Cited (Backward Citations)
US1698845A
Cited
US2266637A
Cited
US2266636A
Cited
GB539982A
Cited
US2661438A
Cited
US2878136A
Cited
US3175117A
Cited
US3351409A
Cited
US3408305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |