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US3051661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ph indicator units in tablet form
Assignee: Bayer Corp
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Filing: 1956-07-03
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Granted: 1962-08-28
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Expires: 1976-07-03
Abstract
No abstract record available.
Inventors
- 👤 Galen F Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:15
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PH INDICATOR UNIT COMPRISING AN INTIMATE HOMOGENEOUS MIXTURE, COMPRESSED IN TABLET FORM, OF FROM ABOUT 0.01% TO ABOUT 0.05% BY WEIGHT, IN THE AGGREGATE, TO BROM CRESON PURPLE, BROM CRESOL GREEN AND A MEMBER OF THE GROUP CONSISTING OF METHYL ORANGE AND DIMETHYL YELLOW, FROM ABOUT 10% TO ABOUT 90% BY WEIGHT OF CELLULOSE POWDER, AND, AS THE REMAINDER, A NEUTRAL, SUBSTANTIALLY WHITE FILLER AND BINDING AGENT, THE PROPORTION OF BROM CRESOL PURPLE:BROM CRESOL GREEN:THE MEMBER OF SAID GROUP BEING 4,5-6,5:-3,0:1.
Claim 2
Dependent Claim
82 words
A PH INDICATOR UNIT COMPRISING AN INTIMATE HOMOGENEOUS MIXTURE, COMPRESSED IN TABLET FORM, OF FROM ABOUT 0.01% TO ABOUT 0.05% BY WEIGHT, IN THE AGGREGATE, TO BROM CRESON PURPLE, BROM CRESOL GREEN AND A MEMBER OF THE GROUP CONSISTING OF METHYL ORANGE AND DIMETHYL YELLOW, FROM ABOUT 10% TO ABOUT 90% BY WEIGHT OF CELLULOSE POWDER, AND, AS THE REMAINDER, A NEUTRAL, SUBSTANTIALLY WHITE FILLER AND BINDING AGENT, THE PROPORTION OF BROM CRESOL PURPLE:BROM CRESOL GREEN:THE MEMBER OF SAID GROUP BEING 4,5-6,5:-3,0:1.
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) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |