US2909662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric field emission methods and apparatus
Assignee: Research Corp
•
Filing: 1955-07-18
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Granted: 1959-10-20
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Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 Hippel Arthur R Von
- 👤 Dean A Powers
- 👤 William B Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:26
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; B; B82; B82Y; B82Y10/00; H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/312; H03; H03F; H03F99/00
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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |