Patent US3698794A successfully refreshed from Google Patents.
US3686573A
Expired / Lapsed
US
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Non-duplication switching arrangement for cable television transmission
Assignee: COAXIAL SCIENTIFIC CORP
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Filing: 1969-09-18
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Granted: 1972-08-22
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Expires: 1989-09-18
Abstract
Abstract A non-duplication switching arrangement for a cable television system comprises cards that are provided with computer-formed punch holes to correspond to the time periods when the same programs are to be presented on different channels. The cards are mounted in carriers which are loaded into a holder. The carriers with the cards are withdrawn successively from the holder and pass through a photoelectric readout arrangement which detects the presence of the holes and operates relays at the headend equipment to delete the particular channel from transmission over the cable during the time periods at which the holes are detected.
Inventors
- 👤 David S Mcvoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:47
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10; H04N7/102; H04N7/104
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
In a multi-channel cable television system including means for combining predetermined channel frequencies and transmitting those frequencies over a cable, and switching means for interrupting the transmission over said cable of at least one of said frequencies to prevent transmission of identical broadcast material over more than one channel at a time; an improvement comprising a sheet having a region corresponding to said one frequency and said sheet having programming means for said region corresponding to the arrival of predetermined moments of time throughout an ascertained interval of time and indicating selected periods of transmission and interruption for said frequency, detector means for actuating said switching means, and means providing relative movement between said sheet and said detector means during said ascertained time interval in a manner to detect the programming means at said region for selectively actuating the switching means for each frequency to interrupt and Transmit said frequency selectively responsive to said predetermined moments of time.
Claim 2
Dependent Claim
158 words
In a multi-channel cable television system including means for combining predetermined channel frequencies and transmitting those frequencies over a cable, and switching means for interrupting the transmission over said cable of at least one of said frequencies to prevent transmission of identical broadcast material over more than one channel at a time; an improvement comprising a sheet having a region corresponding to said one frequency and said sheet having programming means for said region corresponding to the arrival of predetermined moments of time throughout an ascertained interval of time and indicating selected periods of transmission and interruption for said frequency, detector means for actuating said switching means, and means providing relative movement between said sheet and said detector means during said ascertained time interval in a manner to detect the programming means at said region for selectively actuating the switching means for each frequency to interrupt and Transmit said frequency selectively responsive to said predetermined moments of time.
Claim 3
Dependent Claim
22 words
In a system according to claim 1, a carrier for said sheet, and means for moving the carrier past said detector means.
Claim 4
Dependent Claim
19 words
In a system according to claim 1, said sheet being a card having perforations making up the programming means.
Claim 5
Dependent Claim
39 words
In a system according to claim 3, a carrier for said card, a holder containing a stack of said carriers each with a card therein, and means for driving the carriers one-by-one from the holder past the detector means.
Claim 6
Dependent Claim
36 words
In a system according to claim 3, said detector means including a light source and a photocell for receiving light from said source that passes through at least one perforation at said predetermined moments of time.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |