US3688359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a composite shadow mask
Assignee: Hitachi Ltd
•
Filing: 1970-09-01
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Granted: 1972-09-05
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Expires: 1990-09-01
Abstract
Abstract A mesh electrode is coated with an electrically insulating material. The portions of the insulating material are removed where the beam apertures of a shadow mask are to be located when the coated mesh electrode and the shadow mask are combined together. And after finishing the partial removal of the insulating material, the mesh electrode is combined with the shadow mask to produce a composite shadow mask having a converging action upon the electron beam.
Inventors
- 👤 Mitsuru Oikawa
- 👤 Shozo Tamura
- 👤 Tadao Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/80; H01J29/81; H01J9/00; H01J9/02; H01J9/14; H01J9/142
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
A method for fabricating a composite shadow mask according to claim 1 wherein in said exposing step a direct current voltage is applied between said shadow mask electrode and said lens electrode so as to cause both the electrodes to be attracted to each other.
References Cited (Backward Citations)
US2874449A
Cited
US3474511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |