US4040719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency indicator for receiving devices
Assignee: Individual
•
Filing: 1975-07-21
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Granted: 1977-08-09
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Expires: 1995-07-21
Abstract
Abstract A liquid crystal display panel for indicating operating frequency of a receiver is operated by a circuit providing digital control signals and an alternating current signal.
Inventors
- 👤 Heinz F. Schiebelhuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:27
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/02; H03J1/04; H03J3/00; H03J3/02; H03J3/12; H03J3/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A display panel having a plurality of liquid crystal elements arranged to indicate operating frequency of signal receiving means being tuned by a DC analog tuning signal having a continuously variable magnitude comprising: logarithmic analog-to-digital converter means for converting said analog tuning signal to digitally coded signals; decoder means responsive to said digitally coded signals for providing digital control signals; and means for converting said digital control signals to an alternating current signal for operating said liquid crystal elements.
Claim 2
Dependent Claim
79 words
A display panel having a plurality of liquid crystal elements arranged to indicate operating frequency of signal receiving means being tuned by a DC analog tuning signal having a continuously variable magnitude comprising: logarithmic analog-to-digital converter means for converting said analog tuning signal to digitally coded signals; decoder means responsive to said digitally coded signals for providing digital control signals; and means for converting said digital control signals to an alternating current signal for operating said liquid crystal elements.
Claim 3
Dependent Claim
18 words
A display panel according to claim 1, wherein said analog-to-digital converter means operates according to a duel-slope process.
Claim 4
Dependent Claim
16 words
A display panel according to claim 1, wherein said digitally coded signals is in BCD code.
Claim 5
Dependent Claim
27 words
A display panel according to claim 1, wherein said means for converting said digital control signals to said alternating current control signal is an exclusive OR gate.
Claim 6
Dependent Claim
118 words
A display panel for indicating operating frequency of a radio receiver, comprising: a plurality of liquid crystal elements; decoder means; logarithmic analog-to-digital converter means for providing digitally coded signals to said decoder means, said decoder means responding to said coded signals to provide control signals for said liquid crystal elements; voltage tunable oscillator means responsive to a DC analog tuning voltage for varying said operating frequency of said radio receiver, said analog tuning voltage being coupled to said means for providing digitally coded signals to said decoder means, and means for converting said control signals to an alternating current signal and applying said alternating current signals to said liquid crystal elements to display said radio receiver operating frequency.
Claim 7
Dependent Claim
118 words
A display panel for indicating operating frequency of a radio receiver, comprising: a plurality of liquid crystal elements; decoder means; logarithmic analog-to-digital converter means for providing digitally coded signals to said decoder means, said decoder means responding to said coded signals to provide control signals for said liquid crystal elements; voltage tunable oscillator means responsive to a DC analog tuning voltage for varying said operating frequency of said radio receiver, said analog tuning voltage being coupled to said means for providing digitally coded signals to said decoder means, and means for converting said control signals to an alternating current signal and applying said alternating current signals to said liquid crystal elements to display said radio receiver operating frequency.
Claim 8
Dependent Claim
84 words
A liquid crystal display apparatus for indicating operating frequency of a radio receiver, said apparatus being responsive to a DC analog tuning signal determining said radio receiver operating frequency, comprising: logarithmic analog-to-digital converter means for converting said analog tuning signals to digitally coded signals; decoder means responsive to said digitally coded signals for providing digital control signals; and means for converting said digital control signals to an alternating current signal for operating said liquid crystal display apparatus to indicate said radio receiver operating frequency.
Claim 9
Dependent Claim
84 words
A liquid crystal display apparatus for indicating operating frequency of a radio receiver, said apparatus being responsive to a DC analog tuning signal determining said radio receiver operating frequency, comprising: logarithmic analog-to-digital converter means for converting said analog tuning signals to digitally coded signals; decoder means responsive to said digitally coded signals for providing digital control signals; and means for converting said digital control signals to an alternating current signal for operating said liquid crystal display apparatus to indicate said radio receiver operating frequency.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |