Patent US3518567A successfully refreshed from Google Patents.
US3518567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential frequency combiner for frequency standard systems
Assignee: Varian Medical Systems Inc
•
Filing: 1968-08-05
•
Granted: 1970-06-30
•
Expires: 1988-08-05
Abstract
No abstract record available.
Inventors
- 👤 Alan L Helgesson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:00
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/07; G; G04; G04F; G04F5/00
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) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |