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Patent US3421042A successfully refreshed from Google Patents.
US3421042A
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Electron beam scanner utilizing labyrinth structure
Assignee: Northrop Grumman Corp
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Filing: 1967-04-27
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Granted: 1969-01-07
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Expires: 1987-04-27
Abstract
No abstract record available.
Inventors
- 👤 Donald E Hultberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60; G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; G11C13/00; G11C13/04; H01J29/00; H01J29/02; H01J29/023; H01J29/46; H01J29/467; H01J31/10; H01J31/12; H01J31/123; H01J31/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3005127A
Cited
GB932212A
Cited
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 |