Patent US3981562A successfully refreshed from Google Patents.
US3490889A
Expired / Lapsed
US
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Method of sealing a tube opening with a glass membrane
Assignee: Toshiba Corp
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Filing: 1969-04-21
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Granted: 1970-01-20
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Expires: 1989-04-21
Abstract
No abstract record available.
Inventors
- 👤 Eizo Goto
- 👤 Yonekichi Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:31
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/40; C; C03; C03B; C03B23/00; C03B23/20; C03C; C03C27/00; C03C27/06; C03C27/10
Claims Analysis
Total Claims: 0
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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) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |