Patent US4394863A successfully refreshed from Google Patents.
US3798004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test device
Assignee: Biodex Biotechnological and Diagnostic Systems Ltd
•
Filing: 1972-04-18
•
Granted: 1974-03-19
•
Expires: 1992-04-18
Abstract
Abstract An improved dip and read type test device having a flat bibulous matrix having an indicator incorporated therewith, the matrix being disposed between and attached to a pair of liquid impervious members and having exposed peripheral edge portions such that upon immersion into a solution containing material to which said indicator is responsive, flow of said solution into said matrix through said edge portions causes formation of measurable visible indicia pattern on the matrix.
Inventors
- 👤 A Zerachia
- 👤 N Friedgut
- 👤 G Steinman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:42
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/8205
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A test device as defined in claim 1 wherein said one layer has a shape congruent with the shape of said matrix.
Claim 2
Dependent Claim
26 words
A test device as defined in claim 1 wherein said one layer is bonded to said matrix over the entire upper surface area of said matrix.
Claim 3
Dependent Claim
20 words
A test device as defined in claim 3 wherein said one member is bonded to said matrix by heat sealing.
Claim 4
Dependent Claim
22 words
A test device as defined in claim 1 wherein the other of said layers is bonded to said matrix by heat sealing.
Claim 5
Dependent Claim
20 words
A test device as defined in claim 1 wherein the other of said layers is formed with a handle portion.
Claim 6
Dependent Claim
29 words
A test device as defined in claim 1 wherein said test system is present in a quantity relative to the normal concentration of suspected material expected in the solution.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |