US2559269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing indigo vat dye paste
Assignee: EIDP Inc
•
Filing: 1949-05-21
•
Granted: 1951-07-03
•
Expires: 1969-05-21
Abstract
No abstract record available.
Inventors
- 👤 Zinner Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:02
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0077
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE METHOD OF PRODUCING A HIGH DENSITY, ESSENTIALLY AIR-FREE INDIGO PASTE, WHICH WILL NOT CAUSE OBJECTIONABLE FROTH OR FOAM WHEN DYE BATHS ARE PREPARED, FROM A WATER SLURRY OF INDIGO CONTAINING OCCLUDED AIR WHICH COMPRISES FILTERING THE SLURRY TO PRODUCE A FILTER CAKE OF INDIGO, PASSING STEAM THROUGH THE FILTER CAKE UNTIL SUBSTANTIALLY ALL OF THE OCCLUDED AIR IS REMOVED AS INDICATED BY CESSATION OF FLOW OF WATER FROM THE CAKE INTO THE FILTRATE, AND THEN ADDING WATER TO THE FILTER CAKE TO PRODUCE AN INDIGO PASTE OF DESIRED CONCENTRATION.
Claim 2
Independent Claim
90 words
THE METHOD OF PRODUCING A HIGH DENSITY, ESSENTIALLY AIR-FREE INDIGO PASTE, WHICH WILL NOT CAUSE OBJECTIONABLE FROTH OR FOAM WHEN DYE BATHS ARE PREPARED, FROM A WATER SLURRY OF INDIGO CONTAINING OCCLUDED AIR WHICH COMPRISES FILTERING THE SLURRY TO PRODUCE A FILTER CAKE OF INDIGO, PASSING STEAM THROUGH THE FILTER CAKE UNTIL SUBSTANTIALLY ALL OF THE OCCLUDED AIR IS REMOVED AS INDICATED BY CESSATION OF FLOW OF WATER FROM THE CAKE INTO THE FILTRATE, AND THEN ADDING WATER TO THE FILTER CAKE TO PRODUCE AN INDIGO PASTE OF DESIRED CONCENTRATION.
References Cited (Backward Citations)
US1693417A
Cited
US1800965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |