US3449677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse frequency discriminators
Assignee: Thorn Electronics Ltd
•
Filing: 1965-06-01
•
Granted: 1969-06-10
•
Expires: 1985-06-01
Abstract
No abstract record available.
Inventors
- 👤 Anthony Leonard Isaacs
- 👤 Dennis William Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:55
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/26; H03D; H03D3/00; H03D3/02; H03D3/04
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) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |