Patent US4022557A successfully refreshed from Google Patents.
Patent US2729535A successfully refreshed from Google Patents.
US2729535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making alkali-insoluble cellulose glycolic acid ether fabric
Assignee: Individual
•
Filing: 1949-06-22
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Granted: 1956-01-03
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Expires: 1969-06-22
Abstract
No abstract record available.
Inventors
- 👤 Balassa Ladislaus
- 👤 Henry A Christoph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:34
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/207; D06M13/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A PROCESS OF PREPARING ALKALI-INSOLUBLE GLYCOLIC ACID ETHERS OF FIBROUS CELLULOSE COMPRISING IMPREGNATING THE CELLULOSE FABRIC WITH AN AQUEOUS SOLUTION OF AMMONIUM MONOCHLOROACETATE, RETAINING IN THE FABRIC AN AMOUNT OF THE SOLUTION ABOUT EQUAL TO THE WEIGHT OF THE DRY FABRIC CORRESPONDING WITH 5% TO 10% OF CHLOROACETIC ACID CALCULATED ON THE WEIGHT OF THE DRY FABRIC, DRYING THE FABRIC, IMPREGNATING THE DRIED FABRIC WITH A 40 TO 55% AQUEOUS SOLUTION OF SODIUM HYDROXIDE AT TEMPERATURES ABOUT 55 TO 85* C., RETAINING ABOUT 90 TO 110% SODIUM HYDROXIDE SOLUTION CALCULATED ON THE WEIGHT OF THE DRY FABRIC, PERMITTING THE SODIUM HYROXIDE SOLUTION TO REMAIN IN CONTACT WITH THE FABRIC FOR A PERIOD OF FROM 45 SECONDS TO 3 MINUTES, REMOVING THE SODIUM HYDROXIDE WITH EXCESS WATER, AND THEN DRYING THE FABRIC.
Claim 2
Dependent Claim
131 words
A PROCESS OF PREPARING ALKALI-INSOLUBLE GLYCOLIC ACID ETHERS OF FIBROUS CELLULOSE COMPRISING IMPREGNATING THE CELLULOSE FABRIC WITH AN AQUEOUS SOLUTION OF AMMONIUM MONOCHLOROACETATE, RETAINING IN THE FABRIC AN AMOUNT OF THE SOLUTION ABOUT EQUAL TO THE WEIGHT OF THE DRY FABRIC CORRESPONDING WITH 5% TO 10% OF CHLOROACETIC ACID CALCULATED ON THE WEIGHT OF THE DRY FABRIC, DRYING THE FABRIC, IMPREGNATING THE DRIED FABRIC WITH A 40 TO 55% AQUEOUS SOLUTION OF SODIUM HYDROXIDE AT TEMPERATURES ABOUT 55 TO 85* C., RETAINING ABOUT 90 TO 110% SODIUM HYDROXIDE SOLUTION CALCULATED ON THE WEIGHT OF THE DRY FABRIC, PERMITTING THE SODIUM HYROXIDE SOLUTION TO REMAIN IN CONTACT WITH THE FABRIC FOR A PERIOD OF FROM 45 SECONDS TO 3 MINUTES, REMOVING THE SODIUM HYDROXIDE WITH EXCESS WATER, AND THEN DRYING THE FABRIC.
References Cited (Backward Citations)
US1736714A
Cited
US2098335A
Cited
US2101263A
Cited
US2289039A
Cited
US2278612A
Cited
US2393562A
Cited
US2448153A
Cited
US2484545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |