US2576846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions comprising vat dyes
Assignee: —
•
Filing: —
•
Granted: 1951-11-27
•
Expires: 1968-11-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:45
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/62; D06P1/621; D06P1/627; D06P1/22; D06P1/221; D06P1/38; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/58; D06P3/60; D06P3/6025; D06P3/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF VAT DYEING FIBROUS MATERIAL TO WHICH ALKALI METAL SALTS OF LEUCO VAT DYESTUFFS ARE SUBSTANTIVE WITH A VAT DYE WHICH IS SENSITIVE TO OVERREDUCTION AT THE BOILING POINT OF WATER IN AN ORDINARY VAT CONTAINING STRONG ALKALI AND SUFFICIENT REDUCING AGENT TO MAINTAIN REDUCTION OF THE VAT DYESTUFF, WHICH COMPRISES EFFECTING THE DYEING IN THE PRESENCE OF SUCH A BATH CONTAINING, IN ADDITION TO THE STRONG ALKALI AND REDUCING AGENT FOR THE VAT DYESTUFF, AN AMOUNT OF A NITROGEN COMPOUND IN WHICH A NITROGEN IS ATTACHED BY AT LEAST ONE COVALENCE TO OXYGEN AND BY AT LEAST ONE COVALENCE TO AN ELEMENT OTHER THAN OXYGEN OR NITROGEN EQUAL TO AT LEAST ONE-QUARTER THE WEIGHT OF THE REAL DYESTUFF.
Claim 2
Independent Claim
121 words
A METHOD OF VAT DYEING FIBROUS MATERIAL TO WHICH ALKALI METAL SALTS OF LEUCO VAT DYESTUFFS ARE SUBSTANTIVE WITH A VAT DYE WHICH IS SENSITIVE TO OVERREDUCTION AT THE BOILING POINT OF WATER IN AN ORDINARY VAT CONTAINING STRONG ALKALI AND SUFFICIENT REDUCING AGENT TO MAINTAIN REDUCTION OF THE VAT DYESTUFF, WHICH COMPRISES EFFECTING THE DYEING IN THE PRESENCE OF SUCH A BATH CONTAINING, IN ADDITION TO THE STRONG ALKALI AND REDUCING AGENT FOR THE VAT DYESTUFF, AN AMOUNT OF A NITROGEN COMPOUND IN WHICH A NITROGEN IS ATTACHED BY AT LEAST ONE COVALENCE TO OXYGEN AND BY AT LEAST ONE COVALENCE TO AN ELEMENT OTHER THAN OXYGEN OR NITROGEN EQUAL TO AT LEAST ONE-QUARTER THE WEIGHT OF THE REAL DYESTUFF.
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) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |