US2548543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions and methods using reduction-sensitive vat dyes and inorganic nitrites
Assignee: Wyeth Holdings LLC
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Filing: 1949-11-30
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Granted: 1951-04-10
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Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jerry M Mecco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:58
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD OF VAT DYEING FIBROUS MATERIAL TO WHICH ALKALI METAL SALTS OF LEUCO VAT DYESTUFFS ARE SUBSTANTIVE WITH A 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 AN INORGANIC NITRITE AT LEAST ONE-FOURTH THE WEIGHT OF THE REAL DYESTUFF.
Claim 2
Independent Claim
91 words
A METHOD OF VAT DYEING FIBROUS MATERIAL TO WHICH ALKALI METAL SALTS OF LEUCO VAT DYESTUFFS ARE SUBSTANTIVE WITH A 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 AN INORGANIC NITRITE AT LEAST ONE-FOURTH 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) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |