Patent US3473121A successfully refreshed from Google Patents.
US3473121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrum analysis using swept parallel narrow band filters
Assignee: Damon Engineering Inc
•
Filing: 1966-04-06
•
Granted: 1969-10-14
•
Expires: 1986-04-06
Abstract
No abstract record available.
Inventors
- 👤 Carl R Hurtig
- 👤 Austen Madeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:49
CPC Classifications
G; G01; G01R; G01R23/00
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) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |