US3475642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave slow wave dielectric structure and electron tube utilizing same
Assignee: Research Corp
•
Filing: 1966-08-10
•
Granted: 1969-10-28
•
Expires: 1986-08-10
Abstract
No abstract record available.
Inventors
- 👤 Arthur Karp
- 👤 Donald K Winslow
- 👤 Herbert J Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:02
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J23/00; H01J23/16; H01J23/24; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208; H01P1/2084
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |