US3775161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp envelope having clear protective coating and method of making
Assignee: General Electric Co
•
Filing: 1971-12-23
•
Granted: 1973-11-27
•
Expires: 1991-12-23
Abstract
Abstract An electric lamp envelope having an external protective coating which imparts lubricity for the purpose of improving durability and scratch resistance and which also imparts water repellency without reducing light transmission. Particularly useful for fluorescent lamps to reduce flaking or coating off of phosphor caused by vibration resulting from chattering of glass on glass during contact. The coating is very thin transparent film not more than two microns thick containing TiO2 mixed with MgF2, and may be formed by spraying a solution containing an organo titanate such as tetrabutyl titanate and magnesium fluoride on the glass at a temperature between 400* and 700* C.
Inventors
- 👤 W Martyny
- 👤 R Olwert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:46
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C2217/00; C03C2217/20; C03C2217/29; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
Electric glassware as in claim 1 wherein the weight ratio of MgF2 to TiO2 is 1 to 3.5-6.
Claim 2
Dependent Claim
25 words
Electric glassware as in claim 1 wherein the added weight of MgF2 and TiO2 is 1.4 to 2.4 grams per square meter of glass surface.
Claim 3
Dependent Claim
38 words
Electric glassware as in claim 1 wherein the weight ratio of MgF2 to TiO2 is 1 to 3.5-6, and the added weight of MgF2 and TiO2 is from 1.4 to 2.4 grams per square meter of glass surface.
Claim 4
Dependent Claim
48 words
Electric glassware as in claim 1 wherein the weight ratio of MgF2 to TiO2 is 1 to 3.5-6, the added weight of MgF2 and TiO2 is from 1.4 to 2.4 grams per square meter of glass surface, and said layer has a thickness from .05 to 2 microns.
Claim 5
Independent Claim
77 words
The method of providing an external protective coating on vitreous envelopes of electric glassware which comprises mixing 1 part by weight magnesium fluoride wit 6 to 60 parts by weight of tetrabutyl titanate or tetraisopropyl titanate and an organic solvent to make a suspension, and spraying the resulting liquid on the glassware at a tempErature above 400* C and below 700* C to form on the external surface thereof a coating of magnesium fluoride and titanium dioxide.
Claim 6
Dependent Claim
28 words
The method of claim 6 wherein 1 part by weight of magnesium fluoride is mixed with 15 to 25 parts by weight of tetrabutyl titanate or tetraisopropyl titanate.
References Cited (Backward Citations)
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |