US3281832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital to analog conversion apparatus
Assignee: Schlumberger Well Surveying Corp
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Filing: 1964-09-23
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Granted: 1966-10-25
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Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Robert J Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:53
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
APPARATUS FOR CONVERTING DIGITAL DATA INTO ANALOG FORM COMPRISING, A PLURALITY OF RESISTORS HAVING RESPECTIVE VALUES RELATED IN ACCORDANCE WITH THE WEIGHTS OF THE INDIVIDUAL BITS OF THE DIGITAL WORD TO BE APPLIED THERETO, AN OUTPUT IMPEDANCE ELEMENT, RESPECTIVE SWITCH MEANS SELECTIVELY COUPLING ONE END OF EACH OF SAID RESISTORS TO ONE TERMINAL OF SAID OUTPUT IMPEDANCE ELEMENT, THE OTHER TERMINAL THEREOF BEING CONNECTED TO A SOURCE OF REFERENCE POTENTIAL, A VARIABLE POTENTIAL SOURCE COUPLED IN COMMON TO THE OTHER ENDS OF SAID RESISTORS, AND MEANS COUPLED BETWEEN SAID OUTPUT IMPEDANCE ELEMENT AND SAID VARIABLE POTTENTIAL SOURCE TO ADJUST SAID SOURCE IN RESPONSE TO A CHANGE IN POTENTIAL ACROSS SAID OUTPUT IMPEDANCE ELEMENT TO MAINTAIN A CONSTANT POTENTIAL ACROSS SAID RESISTORS.
Claim 2
Dependent Claim
121 words
APPARATUS FOR CONVERTING DIGITAL DATA INTO ANALOG FORM COMPRISING, A PLURALITY OF RESISTORS HAVING RESPECTIVE VALUES RELATED IN ACCORDANCE WITH THE WEIGHTS OF THE INDIVIDUAL BITS OF THE DIGITAL WORD TO BE APPLIED THERETO, AN OUTPUT IMPEDANCE ELEMENT, RESPECTIVE SWITCH MEANS SELECTIVELY COUPLING ONE END OF EACH OF SAID RESISTORS TO ONE TERMINAL OF SAID OUTPUT IMPEDANCE ELEMENT, THE OTHER TERMINAL THEREOF BEING CONNECTED TO A SOURCE OF REFERENCE POTENTIAL, A VARIABLE POTENTIAL SOURCE COUPLED IN COMMON TO THE OTHER ENDS OF SAID RESISTORS, AND MEANS COUPLED BETWEEN SAID OUTPUT IMPEDANCE ELEMENT AND SAID VARIABLE POTTENTIAL SOURCE TO ADJUST SAID SOURCE IN RESPONSE TO A CHANGE IN POTENTIAL ACROSS SAID OUTPUT IMPEDANCE ELEMENT TO MAINTAIN A CONSTANT POTENTIAL ACROSS SAID RESISTORS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |