Patent US2548545A successfully refreshed from Google Patents.
US2548545A
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Pyranthrone dye composition comprising an inorganic nitrite and process for dyeing
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
2026-10-29 06:06
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF VAT DYEING FIBROUS MATERIAL TO WHICH ALKALI METAL SALTS OF THE LEUCO VAT PYRANTHRONE DYE ARE SUBSTANTIVE WITH A PYRANTHRONE DYE, WHICH COMPRISES DYEING THE MATERIAL AT HIGH TEMPERATURE APPROACHING THE BOILING POINT OF WATER IN A BATH CONTAINING THE DYESTUFF, STRONG ALKALI, REDUCING AGENT, AND AN AMOUNT OF AN INORGANIC AT LEAST ONE-QUATER THE WEIGHT OF THE REAL DYESTUFF.
Claim 2
Independent Claim
63 words
A METHOD OF VAT DYEING FIBROUS MATERIAL TO WHICH ALKALI METAL SALTS OF THE LEUCO VAT PYRANTHRONE DYE ARE SUBSTANTIVE WITH A PYRANTHRONE DYE, WHICH COMPRISES DYEING THE MATERIAL AT HIGH TEMPERATURE APPROACHING THE BOILING POINT OF WATER IN A BATH CONTAINING THE DYESTUFF, STRONG ALKALI, REDUCING AGENT, AND AN AMOUNT OF AN INORGANIC AT LEAST ONE-QUATER 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 |