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US4466793A
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US
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Heat treatment jig for use in the manufacture of cathode-ray tubes
Assignee: Mitsubishi Electric Corp
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Filing: 1983-04-04
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Granted: 1984-08-21
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Expires: 2003-04-04
Abstract
Abstract The present invention is a heat treatment jig for use in the baking process, the frit seal process, and the evacuation process during the manufacture of cathode-ray tubes. It comprises a base and one or more support members formed from a novel material comprising mica, talc, orthoboric acid, boric acid anhydride, and zinc oxide molded under heat and pressure. This novel molded material is superior in its mechanical properties to the substances (asbestos tape, asbestos cement, or boron nitride) used for the support members of conventional heat treatment jigs. In addition, it does not pose a danger to health like asbestos products and it is far lower in cost than boron nitride.
Inventors
- 👤 Yoshihiro Murakami
- 👤 Toyoshi Takeuchi
- 👤 Isao Ishii
- 👤 Tadaki Murakami
- 👤 Hiroshi Takayanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:18
CPC Classifications
F; F27; F27D; F27D5/00; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0015; F27D2099/0058; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A heat treatment jig for use in the heat treatment of cathode-ray tubes, comprising: a base; and one or more heat resistant, electrically insulating support members rigidly secured to said base, said support members comprising mica, talc, orthoboric acid, boric acid anhydride, and zinc oxide molded under heat and pressure.
Claim 2
Dependent Claim
50 words
A heat treatment jig for use in the heat treatment of cathode-ray tubes, comprising: a base; and one or more heat resistant, electrically insulating support members rigidly secured to said base, said support members comprising mica, talc, orthoboric acid, boric acid anhydride, and zinc oxide molded under heat and pressure.
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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |