US3223994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1962-09-10
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Granted: 1965-12-14
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Jacky D Cates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:22
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A DIGITAL-TO-ANALOGUE CONVERTER COMPRISING: (A) A PLURALITY OF PARALLEL-CONNECTED CIRCUITS; (B) EACH OF SAID CIRCUITS COMPRISING AN INPUT TERMINAL, A SWITCHING MEANS, AN IMPEDANCE MEANS AND A CONSTANT CURRENT GENERATING MEANS CONNECTED IN SERIES; (C) AN OUTPUT CONDUCTOR HAVING A LOAD RESISTOR CONNECTED THERETO; (D) EACH OF SAID GENERATING MEANS BEING CONNECTED TO SAID OUTPUT CONDUCTOR; (E) EACH OF SAID SWITCHING MEANS BEING ACTUATED IN RESPONSE TO A DIGITAL INPUT REPRESENTATION AT EACH OF SAID INPUT TERMINALS; AND (F) SAID INPUT REPRESENTATION PRODUCING A PROPORTIONAL OUTPUT ANALOGUE REPRESENTATION ACROSS SAID LOAD RESISTOR.
Claim 2
Dependent Claim
92 words
A DIGITAL-TO-ANALOGUE CONVERTER COMPRISING: (A) A PLURALITY OF PARALLEL-CONNECTED CIRCUITS; (B) EACH OF SAID CIRCUITS COMPRISING AN INPUT TERMINAL, A SWITCHING MEANS, AN IMPEDANCE MEANS AND A CONSTANT CURRENT GENERATING MEANS CONNECTED IN SERIES; (C) AN OUTPUT CONDUCTOR HAVING A LOAD RESISTOR CONNECTED THERETO; (D) EACH OF SAID GENERATING MEANS BEING CONNECTED TO SAID OUTPUT CONDUCTOR; (E) EACH OF SAID SWITCHING MEANS BEING ACTUATED IN RESPONSE TO A DIGITAL INPUT REPRESENTATION AT EACH OF SAID INPUT TERMINALS; AND (F) SAID INPUT REPRESENTATION PRODUCING A PROPORTIONAL OUTPUT ANALOGUE REPRESENTATION ACROSS SAID LOAD RESISTOR.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |