Patent US2992971A successfully refreshed from Google Patents.
US2992971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological stains
Assignee: Ortho Pharmaceutical Corp
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Filing: 1956-11-29
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Granted: 1961-07-18
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Expires: 1976-11-29
Abstract
No abstract record available.
Inventors
- 👤 Millman Nathan
- 👤 Homm Roger Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:42
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A SOLID MASS SOLUBLE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER, METHANOL, ETHANOL, AND MIXTURES THEREOF AND SUITABLE FOR THE READY PREPARATION OF STANDARDIZED BIOLOGICAL STAIN SOLUTIONS COMPRISING A CELLULOSIC DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CARBOXYMETHYLCELLULOSE, METHYL CELLULOSE AND ETHYL CELLULOSE, A COMPOUND FOR IMPROVING THE SOLUBILITY OF THE CELLULOSIC DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF UREA, ALLANTOIN AND ETHYL CARBAMATE, AND A BIOLOGICAL STAIN DISTRIBUTED IN THE MASS, THE SOLUBILITY-IMPROVING COMPOUND BEING PRESENT IN AN AMOUNT EQUAL TO ONE-TWENTIETH TO TWOTHIRDS THE WEIGHT OF THE CELLULOSE DERIVATIVE.
Claim 2
Dependent Claim
94 words
A SOLID MASS SOLUBLE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER, METHANOL, ETHANOL, AND MIXTURES THEREOF AND SUITABLE FOR THE READY PREPARATION OF STANDARDIZED BIOLOGICAL STAIN SOLUTIONS COMPRISING A CELLULOSIC DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CARBOXYMETHYLCELLULOSE, METHYL CELLULOSE AND ETHYL CELLULOSE, A COMPOUND FOR IMPROVING THE SOLUBILITY OF THE CELLULOSIC DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF UREA, ALLANTOIN AND ETHYL CARBAMATE, AND A BIOLOGICAL STAIN DISTRIBUTED IN THE MASS, THE SOLUBILITY-IMPROVING COMPOUND BEING PRESENT IN AN AMOUNT EQUAL TO ONE-TWENTIETH TO TWOTHIRDS THE WEIGHT OF THE CELLULOSE DERIVATIVE.
References Cited (Backward Citations)
US2374544A
Cited
US1659131A
Cited
US2032890A
Cited
US1979469A
Cited
US2602042A
Cited
US2581523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |