US4655899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Probe assembly for an apparatus for measuring ionic activity
Assignee: Fujifilm Holdings Corp
•
Filing: 1985-02-20
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Granted: 1987-04-07
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Expires: 2005-02-20
Abstract
Abstract A probe assembly has at least two pairs of probes and a relay for switchably connecting any one pair of the probes to a single electric impedance lowering means. When the pairs of probes are brought into contact with terminals of at least two pairs of ion-selective electrodes of an ionic activity device, the potential difference generated between each pair of said electrodes is successively transferred to a measuring means by way of the electric impedance lowering means.
Inventors
- 👤 Yoshio Saito
- 👤 Osamu Seshimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/307
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
An apparatus for measuring the potential difference of each pair of ion-selective solid state electrodes of a slide ionic activity measuring device wherein each of said electrodes has a terminal exposed from at least either of the upper and lower surfaces of said ionic activity measuring device, said apparatus comprising at least two pairs of probes which are vertically movable and are arranged so as to simultaneously come into contact with the respective terminals of said electrodes; an electric impedance lowering means; and a relay for switchably connecting any one pair of said probes to the electric impedance lowering means.
Claim 2
Independent Claim
100 words
An apparatus for measuring the potential difference of each pair of ion-selective solid state electrodes of a slide ionic activity measuring device wherein each of said electrodes has a terminal exposed from at least either of the upper and lower surfaces of said ionic activity measuring device, said apparatus comprising at least two pairs of probes which are vertically movable and are arranged so as to simultaneously come into contact with the respective terminals of said electrodes; an electric impedance lowering means; and a relay for switchably connecting any one pair of said probes to the electric impedance lowering means.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said electric impedance lowering means is a preamplifier circuit.
Claim 4
Dependent Claim
29 words
The apparatus of claim 1 wherein said relay and said electric impedance lowering means are incorporated into a circuit on a substrate which is in contact with said probes.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein said relay is connected by a pulse signal outputted from a controlling means.
Claim 6
Dependent Claim
11 words
The apparatus of claim 1 wherein said probes are resiliently projected.
References Cited (Backward Citations)
US3468780A
Cited
US3556950A
Cited
US3654113A
Cited
US4053381A
Cited
US4332658A
Cited
US4404288A
Cited
US4517071A
Cited
US4506226A
Cited
US4437970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |