Patent US4934695A successfully refreshed from Google Patents.
US3267355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-range constant current source
Assignee: DRANETZ TECHNOLOGIES Inc
•
Filing: 1963-12-10
•
Granted: 1966-08-16
•
Expires: 1983-12-10
Abstract
No abstract record available.
Inventors
- 👤 Abraham I Dranetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:07
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; H; H02; H02J; H02J3/00; H02J3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
278 words
A MULTI-RANGE CONSTANT CURRENT SOURCE COMPRISING: (A) A SOURCE OF ALTERNATING VOLTAGE; (B) A LOAD IMPEDANCE; (C) A PLURALITY OF CONSTANT CURRENT RESISTORS OF SUCH VALUE THAT AT LEAST ONE OF THEM HAS A VALUE AT LEAST TEN TIMES THAT OF THE LOAD IMPEDANCE; (D) A FIRST SWITCH DECK HAVING A PLURALITY OF TERMINALS AND A MOVABLE WIPER ARM FOR SELECTIVELY MAKING CONNECTION TO EACH OF SAID PLURALITY OF TERMINALS; (E) A SECOND SWITCH DECK HAVING A PLURALITY OF TERMINALS AND A MOVABLE WIPER ARM FOR SELECTIVELY MAKING CONNECTION TO EACH OF SAID PLURALITY OF TERMINALS; (F) EACH OF SAID PLURALITY OF CONSTANT CURRENT RESISTORS BEING CONNECTED BETWEEN A TERMINAL ON THE FIRST SWITCH DECK AND A TERMINAL ON THE SECOND SWITCH DECK; (G) A PLURALITY OF IMPEDANCES; (H) EACH OF SAID PLURALITY OF IMPEDANCES BEING CONNECTED BETWEEN ONE OF THE TERMINALS OF THE FIRST SWITCH DECK AND GROUND; (I) THE LOAD IMPEDANCE BEING CONNECTED BETWEEN THE MOVABLE WIPER ARM OF THE SECOND SWITCH DECK AND GROUND; (J) THE SOURCE OF ALTERNATING VOLTAGE BEING CONNECTED TO THE MOVABLE WIPER ARM OF THE FIRST SWITCH DECK; (K) MEANS FOR SELECTIVELY MOVING THE MOVABLE WIPER ARM OF THE FIRST SWITCH DECK SUCH THAT ONE OF THE PLURALITY OF CONSTANT CURRENT RESISTORS IS CONNECTED TO THE SOURCE OF ALTERNATING VOLTAGE; (L) MEANS FOR SELECTIVELY MOVING THE MOVABLE WIPER ARM OF THE SECOND SWITCH DECK SUCH THAT THE CONSTANT CURRENT RESISTOR SELECTED BY THE MOVABLE WIPER ARM OF THE FIRST SWITCH DECK IS CONNECTED TO THE LOAD IMPEDANCE; (M) THE VALUES OF THE PLURALITY OF IMPEDANCES BEING SUCH THAT THE UNSELECTED TERMINALS TO WHICH THEY ARE CONNECTED ARE AT SUBSTANTIALLY GROUND POTENTIAL.
Claim 2
Dependent Claim
278 words
A MULTI-RANGE CONSTANT CURRENT SOURCE COMPRISING: (A) A SOURCE OF ALTERNATING VOLTAGE; (B) A LOAD IMPEDANCE; (C) A PLURALITY OF CONSTANT CURRENT RESISTORS OF SUCH VALUE THAT AT LEAST ONE OF THEM HAS A VALUE AT LEAST TEN TIMES THAT OF THE LOAD IMPEDANCE; (D) A FIRST SWITCH DECK HAVING A PLURALITY OF TERMINALS AND A MOVABLE WIPER ARM FOR SELECTIVELY MAKING CONNECTION TO EACH OF SAID PLURALITY OF TERMINALS; (E) A SECOND SWITCH DECK HAVING A PLURALITY OF TERMINALS AND A MOVABLE WIPER ARM FOR SELECTIVELY MAKING CONNECTION TO EACH OF SAID PLURALITY OF TERMINALS; (F) EACH OF SAID PLURALITY OF CONSTANT CURRENT RESISTORS BEING CONNECTED BETWEEN A TERMINAL ON THE FIRST SWITCH DECK AND A TERMINAL ON THE SECOND SWITCH DECK; (G) A PLURALITY OF IMPEDANCES; (H) EACH OF SAID PLURALITY OF IMPEDANCES BEING CONNECTED BETWEEN ONE OF THE TERMINALS OF THE FIRST SWITCH DECK AND GROUND; (I) THE LOAD IMPEDANCE BEING CONNECTED BETWEEN THE MOVABLE WIPER ARM OF THE SECOND SWITCH DECK AND GROUND; (J) THE SOURCE OF ALTERNATING VOLTAGE BEING CONNECTED TO THE MOVABLE WIPER ARM OF THE FIRST SWITCH DECK; (K) MEANS FOR SELECTIVELY MOVING THE MOVABLE WIPER ARM OF THE FIRST SWITCH DECK SUCH THAT ONE OF THE PLURALITY OF CONSTANT CURRENT RESISTORS IS CONNECTED TO THE SOURCE OF ALTERNATING VOLTAGE; (L) MEANS FOR SELECTIVELY MOVING THE MOVABLE WIPER ARM OF THE SECOND SWITCH DECK SUCH THAT THE CONSTANT CURRENT RESISTOR SELECTED BY THE MOVABLE WIPER ARM OF THE FIRST SWITCH DECK IS CONNECTED TO THE LOAD IMPEDANCE; (M) THE VALUES OF THE PLURALITY OF IMPEDANCES BEING SUCH THAT THE UNSELECTED TERMINALS TO WHICH THEY ARE CONNECTED ARE AT SUBSTANTIALLY GROUND POTENTIAL.
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |