US3382430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double bridge apparatus for determining electrolytic conductivity
Assignee: Beckman Coulter Inc
•
Filing: 1965-07-26
•
Granted: 1968-05-07
•
Expires: 1985-07-26
Abstract
No abstract record available.
Inventors
- 👤 Leo C Cunniff
- 👤 Rosenthal Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/045; G01N27/046
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
ELECTRICAL MEASURING APPARATUS COMPRISING IN COMBINATION, A FIRST AND SECOND BRIDGE, SAID FIRST BRIDGE HAVING A CONDUCTIVITY CELL IN ONE ARM THEREOF FOR MEASURING SOLUTE CONCENTRATION AND A VARIABLE RESISTOR IN ANOTHER ARM THEREOF, SAID SECOND BRIDGE HAVING A VARIABLE RESISTOR IN EACH OF TWO DIFFERENT ARMS THEREOF, MEANS MECHANICALLY COUPLING SAID VARIABLE RESISTOR OF SAID FIRST BRIDGE AND ONE OF SAID VARIABLE RESISTORS OF SAID SECOND BRIDGE, SAID MEANS BEING RESPONSIVE TO UNBALANCE IN SAID FIRST BRIDGE DUE TO ADDITION OF SOME OF SAID SOLUTE TO SAID CELL, AND MOVABLE MEANS COUPLED TO THE OTHER OF SAID RESISTORS OF SAID SECOND BRIDGE FOR RE-BALANCING SAID SECOND BRIDGE IN RESPONSE TO UNBALANCE IN SAID SECOND BRIDGE DUE TO A CHANGE IN THE RESISTANCE OF SAID ONE RESISTOR THEREOF.
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) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |