Patent US2768051A successfully refreshed from Google Patents.
US2768051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vat dyeing of animal fibers using esters
Assignee: —
•
Filing: —
•
Granted: 1956-10-23
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Expires: 1973-10-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:08
CPC Classifications
D; D06; D06B; D06B1/00; D06B1/04; D06B1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A METHOD OF DYEING ANIMAL FIBERS IN CONTINUOUS FASHION WHICH COMPRISES IMPREGNATING SAID FIBERS WITH A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF VAT AND SULPHUR DYESTUFFS, FIXING SAID DYESTUFF UPON SAID FIBERS BY PASSING SAID FIBERS THROUGH AN ALKALINE AQUEOUS REDUCING LIQUOR BATH, REMOVING THE IMPREGNATED FIBERS CONTAINING ENTRAINED LIQUOR FROM THE BATH AND REACTING WITH SAID ENTRAINED LIQUOR AT ELEVATED TEMPERATURE FOR A PERIOD OF FROM 7 SECONDS TO ONE MINUTE AN ORGANIC ESTER WHICH IS PRESENT AND IS BEING HYDROLYZED BY SAID ALKALINE REDUCING SAID ORGANIC ESTER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYL LACTATE, NORMAL PROPYL ACETATE, ISOPROPYL ACETATE AND DIETHYL TARTRATE WHILE THE LIQUOR IS FIXING SAID DYESTUFF UPON SAID FIBER, AT LEAST THE MAJOR AMOUNT OF SAID NEUTRALIZATION OCCURRING AFTER THE FIBERS ARE REMOVED FROM THE ALKALINE AQUEOUS REDUCING LIQUOR BATH.
Claim 2
Independent Claim
138 words
A METHOD OF DYEING ANIMAL FIBERS IN CONTINUOUS FASHION WHICH COMPRISES IMPREGNATING SAID FIBERS WITH A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF VAT AND SULPHUR DYESTUFFS, FIXING SAID DYESTUFF UPON SAID FIBERS BY PASSING SAID FIBERS THROUGH AN ALKALINE AQUEOUS REDUCING LIQUOR BATH, REMOVING THE IMPREGNATED FIBERS CONTAINING ENTRAINED LIQUOR FROM THE BATH AND REACTING WITH SAID ENTRAINED LIQUOR AT ELEVATED TEMPERATURE FOR A PERIOD OF FROM 7 SECONDS TO ONE MINUTE AN ORGANIC ESTER WHICH IS PRESENT AND IS BEING HYDROLYZED BY SAID ALKALINE REDUCING SAID ORGANIC ESTER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYL LACTATE, NORMAL PROPYL ACETATE, ISOPROPYL ACETATE AND DIETHYL TARTRATE WHILE THE LIQUOR IS FIXING SAID DYESTUFF UPON SAID FIBER, AT LEAST THE MAJOR AMOUNT OF SAID NEUTRALIZATION OCCURRING AFTER THE FIBERS ARE REMOVED FROM THE ALKALINE AQUEOUS REDUCING LIQUOR BATH.
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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |