US2539958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating casein threads, fibers, and the like
Assignee: Akzona Inc
•
Filing: 1947-07-14
•
Granted: 1951-01-30
•
Expires: 1967-07-14
Abstract
No abstract record available.
Inventors
- 👤 Maaskant Leendert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:51
CPC Classifications
D; D01; D01F; D01F4/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
A PROCESS OF INCREASING THE RESISTANCE OF PRE-HARDENED THREADS, FIBERS, AND THE LIKE OF SYNTHETIC CASEIN ORIGIN TO HOT DILUTE ACID DYE BATHS WHICH COMPRISES TREATING THE PRODUCTS WITH AN ACID SOLUTION OF PRECONDENSATION PRODUCTS OF (A) FORMALDEHYDE AND (B) A COMPOUND OF THE CLASS CONSISTING OF RESORCINOL, CHLORO-, LOWER ALKOXY-, AND CARBOXY-SUBSTITUTED RESORCINOLS IN THE PREPARATION OF WHICH AT LEAST SIX MOLS OF (A) PER MOL OF (B) ARE EMPLOYED, REMOVING THE THUS TREATED PRODUCTS FROM THE SOLUTION AND CENTRIFUGING, DRYING AND HEATING WHEREBY WHEN THE PRODUCTS ARE SUBJECTED TO SUBSEQUENT TREATMENTS IN HOT DILUTE ACID BATHS, THEIR ORIGINAL FLEXIBILITY AND FULLNESS OF HAND ARE SUBSTANTIALLY RETAINED.
References Cited (Backward Citations)
US1693926A
Cited
US2103138A
Cited
US2240388A
Cited
US2234138A
Cited
US2211961A
Cited
US2312998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |