Patent US4058174A successfully refreshed from Google Patents.
US4070495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope slide
Assignee: Roche Diagnostics GmbH
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Filing: 1976-03-31
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Granted: 1978-01-24
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Expires: 1996-03-31
Abstract
Abstract Microscope slide for blood investigation having a coating of highly purified methylene blue N and highly purified cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5.
Inventors
- 👤 Dieter Berger
- 👤 Werner Guthlein
- 👤 Wolfgang Werner
- 👤 Peter Rieckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:04
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
Microscope slide for blood investigation comprising a coating of chromatographically pure methylene blue N and cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5.
Claim 2
Dependent Claim
27 words
Microscope slide for blood investigation comprising a coating of chromatographically pure methylene blue N and cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5.
Claim 3
Dependent Claim
15 words
Microscope slide of claim 1 wherein the methylene blue N is present as the monohydrochloride.
Claim 4
Dependent Claim
15 words
Microscope slide of claim 1 wherein the dyestuffs are applied by spraying a solution thereof.
Claim 5
Dependent Claim
30 words
Use of chromatographically pure methylene blue N and cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5 for the production of pre-colored microscope slides for blood investigation.
Claim 6
Dependent Claim
30 words
Use of chromatographically pure methylene blue N and cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5 for the production of pre-colored microscope slides for blood investigation.
Claim 7
Dependent Claim
30 words
Improved process for blood investigation wherein chromatographically pure methylene blue N and cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5 are used on pre-colored microscope slides.
Claim 8
Dependent Claim
30 words
Improved process for blood investigation wherein chromatographically pure methylene blue N and cresyl violet acetate in a weight ratio of from 1:1.5 to 1:5 are used on pre-colored microscope slides.
References Cited (Backward Citations)
US3906120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |