US4609809B1
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US4609809B1 - - Google Patents
Assignee: Hitachi Ltd
•
Filing: 1984-03-16
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Granted: 1993-01-26
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Expires: 2004-03-16
Abstract
No abstract record available.
Inventors
- 👤 Yamaguchi Hiroshi
- 👤 Shimase Akira
- 👤 Miyauchi Tateoki
- 👤 Hongo Mikio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:17
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/68; G03F1/72; G03F1/74; B; B23; B23K; B23K15/00; B23K15/08; B23K17/00; H; H01; H01J; H01J37/00; H01J37/30; H01J37/305; H01J37/3053; H01J37/3056; H01J2237/00; H01J2237/06; H01J2237/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-26 | 1996-07-27 | 1997-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-26 | 2000-07-27 | 2001-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-26 | 2004-07-27 | 2005-01-26 | $7700.00 | Window Closed / Lapsed |