US3509504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic focusing system
Assignee: Thales SA
•
Filing: 1968-03-07
•
Granted: 1970-04-28
•
Expires: 1988-03-07
Abstract
No abstract record available.
Inventors
- 👤 Roger E Joannais
- 👤 Raymond Defain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:36
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/0873
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2812469A
Cited
US2867745A
Cited
US2843775A
Cited
US3061754A
Cited
US3178602A
Cited
US3271616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |