Patent US3674369A successfully refreshed from Google Patents.
Patent US3449510A successfully refreshed from Google Patents.
US3449510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for producing a dissymmetrical switching signal in an ntsc-pal conversion system
Assignee: US Philips Corp
•
Filing: 1965-09-16
•
Granted: 1969-06-10
•
Expires: 1985-09-16
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang Steinkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:53
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2735886A
Cited
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 |