US4746346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing air-tight, heat-resistant plate
Assignee: Mitsubishi Electric Corp
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Filing: 1987-01-27
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Granted: 1988-05-24
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Expires: 2007-01-27
Abstract
Abstract A method for producing an air-tight, heat-resistant plate for a particular use in manufacturing bulbous fluorescent lamp, which comprises: preparing a shaping material by mixing an inorganic filler composed of alumina powder and silica powder in a specified compositional ratio, and glass powder having a thermal expansion coefficient of 8.5 to 11.5x10-6/ DEG C., both inorganic filler and glass material being blended at a predetermined ratio then, forming the shaping material into a shaped product of any desired configuration by a known shaping method; thereafter heating this shaped body to a temperature, at which the glass powder used becomes molten and fused, thereby rendering it to be a burned body.
Inventors
- 👤 Tadaki Murakami
- 👤 Kiyoshi Takata
- 👤 Kazuharu Kato
- 👤 Kazuo Okahashi
- 👤 Hitoshi Yamazaki
- 👤 Takao Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:34
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/32; H01J61/327; C; C03; C03C; C03C14/00; C03C14/004; C03C2214/00; C03C2214/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A method for producing an air-tight, heat-resistant plate which comprises steps of: (a) preparing a shaping material by mixing 25 to 45% by weight of an inorganic filler consisting essentially of 100 parts by weight of alumina powder and 15 to 50 parts by weight of silica powder; and 55 to 75% by weight of glass powder having a glass transition point of 500° C. or above and a thermal expansion coefficient of from 8.5×10 -6 /° C. to 11.5×10 -6 /° C.; (b) forming said shaping material into a shaped body of a desired configuration by an ordinary forming method; and (c) heating to burn said shaped body at a temperature, at which said glass powder becomes molten and fused, thereby obtaining a burned body.
Claim 2
Independent Claim
126 words
A method for producing an air-tight, heat-resistant plate which comprises steps of: (a) preparing a shaping material by mixing 25 to 45% by weight of an inorganic filler consisting essentially of 100 parts by weight of alumina powder and 15 to 50 parts by weight of silica powder; and 55 to 75% by weight of glass powder having a glass transition point of 500° C. or above and a thermal expansion coefficient of from 8.5×10 -6 /° C. to 11.5×10 -6 /° C.; (b) forming said shaping material into a shaped body of a desired configuration by an ordinary forming method; and (c) heating to burn said shaped body at a temperature, at which said glass powder becomes molten and fused, thereby obtaining a burned body.
Claim 3
Dependent Claim
53 words
The method for producing an air-tight, heat-resistant plate according to claim 1, wherein a coloring matter selected from the group consisting of titanium oxide and zinc oxide in powder form is added in a quantity of not more than 5 parts by weight relative to 100 parts by weight of said shaping material.
Claim 4
Dependent Claim
33 words
The method for producing an air-tight, heat-resistant plate according to claim 1, wherein each of the alumina powder, silica powder and glass powder has an average particle size of 10 μm or below.
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |