US3474245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning electron microscope
Assignee: Hitachi Ltd
•
Filing: 1966-06-21
•
Granted: 1969-10-21
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Expires: 1986-06-21
Abstract
No abstract record available.
Inventors
- 👤 Hirokazu Kimura
- 👤 Hifumi Tamura
- 👤 Michiyoshi Maki
- 👤 Hisayuki Higuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/44; H01J49/46; H01J49/48; H01J49/488; H01J37/00; H01J37/02; H01J37/244; H01J37/26; H01J37/28; H01J2237/00; H01J2237/244; H01J2237/24405; H01J2237/2448; H01J2237/2449; H01J2237/245; H01J2237/24507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2769911A
Cited
US3223837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |