US2998392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution for testing for polymorphonuclear leukocytes
Assignee: University of California Berkeley
•
Filing: 1956-06-18
•
Granted: 1961-08-29
•
Expires: 1976-06-18
Abstract
No abstract record available.
Inventors
- 👤 Oscar W Schalm
- 👤 Daniel O Noorlander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:52
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/5005; G01N33/5094
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A SOLUTION FOR TESTING FOR POLYMORPHONUCLEAR LEUKOCYTES CONSISTING ESSENTIALLY OF: A PH NEUTRAL, 1.5 TO 5% AQUEOUS SOLUTION OF AN ANIONIC SURFACE ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF THE SODIUM ALKYL ARYL SULFONATES, POTASSIUM ALKYL ARYL SULFONATES, SODIUM ALKYL SULFATES, POTASSIUM ALKYL SULFATES; AND A PH INDICATOR IN AN AMOUNT SUFFICIENT TO CHANGE IN COLOR IN RESPONSE TO A CHANGE IN THE PH OF THE SOLUTION AND HAVING A NEUTRAL EQUILIBRIUM CONSTANT.
References Cited (Backward Citations)
US1803076A
Cited
US2194131A
Cited
US2498344A
Cited
US2502881A
Cited
US2709670A
Cited
US2643230A
Cited
US2659700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |