US3104150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing with leuco-vat dye esters polypropylene fibers and cellulosic fiber unions therewith
Assignee: Hercules Powder Co
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Filing: 1961-09-27
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Granted: 1963-09-17
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Expires: 1981-09-27
Abstract
No abstract record available.
Inventors
- 👤 Dadoly Georgia
- 👤 Theron G Finzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:51
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28; Y; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE PROCESS OF DYEING FIBERS CONSISTING ESSENTIALLY OF STEROREGULAR POLYPROPYLENE WHICH COMPRISES: (1) APPLYING TO SAID FIBERS, PRIOR TO DYEING, AN AQUEOUS SOLUTION OF A REDUCING AGENT FOR VAT DYESTUFFS, AND REDUCING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM FORMALDEHYDE SULFOXYLATE, ZINC FORMALDEHYDE SULFOXYLATE, AND THIOUREA DIOXIDE, AND BEING EFFECTIVE IN NEUTRAL AND ACID SOLUTION; (2) THEREAFTER CONTACTING THE THUS PRETREATED FIBERS WITH AN ACIDIFIED AQUEOUS DYEBATH CONTAINING A DYE SELECTED FROM THE GROUP CONSISTING OF THE SULFURIC ACID ESTERS OF LEUCO VAT DYESTUFFS AND A REDUCING AGENT FOR VAT DYESTUFFS AS DEFINED IN STEP (1) ABOVE; (3) DYEING SAID FIBERS AT THE BOILING POINT OF THE DYEBATH; (4) AND SUBSEQUENTLY OXIDIZING THE DYED FIBERS TO DEVELOP THE OXIDIZED FORM OF THE DYE.
Claim 2
Dependent Claim
125 words
THE PROCESS OF DYEING FIBERS CONSISTING ESSENTIALLY OF STEROREGULAR POLYPROPYLENE WHICH COMPRISES: (1) APPLYING TO SAID FIBERS, PRIOR TO DYEING, AN AQUEOUS SOLUTION OF A REDUCING AGENT FOR VAT DYESTUFFS, AND REDUCING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM FORMALDEHYDE SULFOXYLATE, ZINC FORMALDEHYDE SULFOXYLATE, AND THIOUREA DIOXIDE, AND BEING EFFECTIVE IN NEUTRAL AND ACID SOLUTION; (2) THEREAFTER CONTACTING THE THUS PRETREATED FIBERS WITH AN ACIDIFIED AQUEOUS DYEBATH CONTAINING A DYE SELECTED FROM THE GROUP CONSISTING OF THE SULFURIC ACID ESTERS OF LEUCO VAT DYESTUFFS AND A REDUCING AGENT FOR VAT DYESTUFFS AS DEFINED IN STEP (1) ABOVE; (3) DYEING SAID FIBERS AT THE BOILING POINT OF THE DYEBATH; (4) AND SUBSEQUENTLY OXIDIZING THE DYED FIBERS TO DEVELOP THE OXIDIZED FORM OF THE DYE.
References Cited (Backward Citations)
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Cited
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Cited
US2379354A
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US2911398A
Cited
US2932550A
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GB847236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |