Patent US4517741B1 successfully refreshed from Google Patents.
US3145086A
Expired / Lapsed
US
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Diagnostic composition
Assignee: Bayer Corp
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Filing: 1960-05-05
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Granted: 1964-08-18
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Expires: 1980-05-05
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Free
- 👤 Gary D Lower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/62; C; C12; C12Q; C12Q1/00; C12Q1/58; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10T; Y10T436/00; Y10T436/17; Y10T436/171538
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A COMPOSITION FOR DETECTING UREA PRESENT IN A FLUID WHICH COMPRISES A BIBULOUS MATERIAL CONTAINING IMPREGNATED THEREIN AN ENZYME SYSTEM HAVING UREASE ACTIVITY, AN INDICATOR MATERIAL WHICH CHANGES COLOR IN THE PRESENCE OF A PH CHANGE AND A BUFFER FOR MAINTAINING THE PH OF THE COMPOSITION WITHIN A PREDETERMINED RANGE IN THE PRESENCE OF THE FLUID CONTAINING SAID UREA.
Claim 2
Dependent Claim
59 words
A COMPOSITION FOR DETECTING UREA PRESENT IN A FLUID WHICH COMPRISES A BIBULOUS MATERIAL CONTAINING IMPREGNATED THEREIN AN ENZYME SYSTEM HAVING UREASE ACTIVITY, AN INDICATOR MATERIAL WHICH CHANGES COLOR IN THE PRESENCE OF A PH CHANGE AND A BUFFER FOR MAINTAINING THE PH OF THE COMPOSITION WITHIN A PREDETERMINED RANGE IN THE PRESENCE OF THE FLUID CONTAINING SAID UREA.
References Cited (Backward Citations)
US2848308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |