Patent US4425579A successfully refreshed from Google Patents.
US4425579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catv converter with keylock to favorite channels
Assignee: TV/COM TECHNOLOGIES Inc
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Filing: 1981-05-22
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Granted: 1984-01-10
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Expires: 2001-05-22
Abstract
Abstract A cable television converter includes an oscillator and mixer for conversion of a selected input television channel to the specific output frequency of the converter. There is a program selection device, and a memory responsive thereto whereby a subscriber may designate certain channels for conversion to the output frequency. The program selection device provides for restricting access to only those designated channels in the memory whereby a subscriber may control access of members of the household to only certain permitted channels.
Inventors
- 👤 Richard G. Merrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:32
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
Cable TV converter means for selection of a specific input channel for conversion to an output frequency, including oscillator and mixer means for conversion of an input television channel to an output frequency, program selection means controlling said oscillator means, memory means responsive to said program selection means whereby a subscriber may designate certain channels for conversion to said output frequency, said program selection means and memory means permitting sequential preview of the designated channels by a subscriber, and means for restricting access of said program selection means to only those designated channels in said memory means including means for causing said memory and program selection means to convert only designated input channels to said output frequency upon selection of a non-designated channel.
Claim 2
Dependent Claim
123 words
Cable TV converter means for selection of a specific input channel for conversion to an output frequency, including oscillator and mixer means for conversion of an input television channel to an output frequency, program selection means controlling said oscillator means, memory means responsive to said program selection means whereby a subscriber may designate certain channels for conversion to said output frequency, said program selection means and memory means permitting sequential preview of the designated channels by a subscriber, and means for restricting access of said program selection means to only those designated channels in said memory means including means for causing said memory and program selection means to convert only designated input channels to said output frequency upon selection of a non-designated channel.
Claim 3
Dependent Claim
22 words
The converter means of claim 1 further characterized by and including means for changing the designated channels stored in said memory means.
Claim 4
Dependent Claim
51 words
The converter means of claim 1 further characterized in that said oscillator and mixer means for conversion of an input channel to an output frequency includes first and second oscillators and first and second mixers, with said program selection means controlling said first oscillator which is connected to said first mixer.
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |