US2544909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for deaerating indigo paste
Assignee: EIDP Inc
•
Filing: 1949-05-25
•
Granted: 1951-03-13
•
Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Wright Walter Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0096; C09B67/0071; C09B67/0077
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR REMOVING AIR FROM INDIGO PASTE WHICH COMPRISES THINNING AN INDIGO PASTE WHICH CONTAINS OCCLUDED AIR WITH A SMALL AMOUNT OF A NON-FOAMING DISPERSING AGENT AND THEN SUBJECTING THE THINNED PASTE TO A REDUCED ABSOLUTE PRESSURE OF NOT OVER 50 MM. OF MERCURY IN THE FORM OF A MOVING FILM UNTIL ESSENTIALLY ALL OF THE AIR IS REMOVED FROM THE PASTE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR REMOVING AIR FROM INDIGO PASTE WHICH COMPRISES THINNING AN INDIGO PASTE WHICH CONTAINS OCCLUDED AIR WITH A SMALL AMOUNT OF A NON-FOAMING DISPERSING AGENT AND THEN SUBJECTING THE THINNED PASTE TO A REDUCED ABSOLUTE PRESSURE OF NOT OVER 50 MM. OF MERCURY IN THE FORM OF A MOVING FILM UNTIL ESSENTIALLY ALL OF THE AIR IS REMOVED FROM THE PASTE.
References Cited (Backward Citations)
US1999147A
Cited
US2306265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |