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Patent US3420683A successfully refreshed from Google Patents.
US3420683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low melting glass
Assignee: NEC Corp
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Filing: 1963-12-11
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Granted: 1969-01-07
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Expires: 1983-12-11
Abstract
No abstract record available.
Inventors
- 👤 Koichi Ikeda
- 👤 Shigeru Tsuji
- 👤 Shinzo Anazawa
- 👤 Tsukasa Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:36
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/142; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/145; C03C3/253
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |