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Patent US3453478A successfully refreshed from Google Patents.
US3453478A
Expired / Lapsed
US
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Needle-type electron source
Assignee: SRI International Inc
•
Filing: 1966-05-31
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Granted: 1969-07-01
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Expires: 1986-05-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth R Shoulders
- 👤 Louis N Heynick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:50
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1017648A
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US1859875A
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US2290655A
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US2697800A
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US3163753A
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US3309523A
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US2983847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |