US3234325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of cross-talk in video recordings
Assignee: US Philips Corp
•
Filing: 1962-06-05
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Granted: 1966-02-08
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Expires: 1982-06-05
Abstract
No abstract record available.
Inventors
- 👤 Backers Franciscus Theodorus
- 👤 Wessels Johannes Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:14
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/61; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/48; G11B5/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
APPARATUS FOR RECORDING AND/OR REPRODUCING VIDEO SIGNALS INCLUDING VIDEO AND LINE-SYNCHRONIZING SIGNALS ON A MAGNETIC RECORD CARRIER, COMPRISING: AT LEAST ONE ROTATING MAGNETIC HEAD, A HOLLOW STATIONARY DRUM HAVING A SLOT IN THE SURFACE THEREOF, SAID HEAD ROTATING IN SAID DRUM IN CLOSE PROXIMITY TO SAID SLOT, A MOVING MAGNETIC RECORD CARRIER WOUND HELICALLY ON SAID DRUM IN THE VICINITY OF SAID SLOT AND MAGNETICALLY CO-ACTING WITH SAID HEAD, THE ROTATING HEAD AND THE MOVING CARRIER THEREBY FORMING A PLURALITY OF PARALLEL MAGNETIC TRACKS ON THE CARRIER EACH OF WHICH INCLUDES AT LEAST ONE FIELD OF THE VIDEO SIGNAL, SAID FIELD CONTAINING A PLURALITY OF LINE-SYNCHRONIZING SIGNALS, THE CARRIER HAVING A SPEED SUCH THAT THE AREAS AT WHICH THE LINE-SYNCHRONIZING SIGNALS OF ALL THE TRACKS ARE RECORDED ARE LOCATED ON LINES IN THE PLANE OF THE CARRIER EXTENDING AT RIGHT ANGLES TO THE DIRECTION OF LENGTH OF THE TRACKS.
Claim 2
Dependent Claim
149 words
APPARATUS FOR RECORDING AND/OR REPRODUCING VIDEO SIGNALS INCLUDING VIDEO AND LINE-SYNCHRONIZING SIGNALS ON A MAGNETIC RECORD CARRIER, COMPRISING: AT LEAST ONE ROTATING MAGNETIC HEAD, A HOLLOW STATIONARY DRUM HAVING A SLOT IN THE SURFACE THEREOF, SAID HEAD ROTATING IN SAID DRUM IN CLOSE PROXIMITY TO SAID SLOT, A MOVING MAGNETIC RECORD CARRIER WOUND HELICALLY ON SAID DRUM IN THE VICINITY OF SAID SLOT AND MAGNETICALLY CO-ACTING WITH SAID HEAD, THE ROTATING HEAD AND THE MOVING CARRIER THEREBY FORMING A PLURALITY OF PARALLEL MAGNETIC TRACKS ON THE CARRIER EACH OF WHICH INCLUDES AT LEAST ONE FIELD OF THE VIDEO SIGNAL, SAID FIELD CONTAINING A PLURALITY OF LINE-SYNCHRONIZING SIGNALS, THE CARRIER HAVING A SPEED SUCH THAT THE AREAS AT WHICH THE LINE-SYNCHRONIZING SIGNALS OF ALL THE TRACKS ARE RECORDED ARE LOCATED ON LINES IN THE PLANE OF THE CARRIER EXTENDING AT RIGHT ANGLES TO THE DIRECTION OF LENGTH OF THE TRACKS.
References Cited (Backward Citations)
US2965708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |