US3309215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yellow colored cellulosic article and method of coloring the same
Assignee: FMC Corp
•
Filing: 1963-07-03
•
Granted: 1967-03-14
•
Expires: 1983-07-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Wilbur T Brader
- 👤 Edward B Jaynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:25
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J2301/00; C08J2301/08; C08J2301/22; C08J2301/24; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31888; Y10T428/31891; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31986
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A METHOD OF PREPARING A CLEAR REGENERATED CELLULOSE FILM HAVING A STABLE BRIGHT YELLOW COLOR WHICH COMPRISES TREATING SAID FILM, IN THE WET GEL STATE, WITH AN AQUEOUS SOLUTION OF ABOUT 5% BY WEIGHT OF CADMIUM CHLORIDE, REMOVING EXCESS SOLUTION FROM THE FILM, THEN IMMERSING SAID FILM IN AN AQUEOUS SOLUTION OF ABOUT 2% BY WEIGHT OF SODIUM SULFIDE FOR A PERIOD OF AT LEAST 2 SECONDS, WASHING THE FILM, AND CURING THE FILM UNDER TENSION FOR AT LEAST SEVERAL MINUTES AT AN ELEVATED TEMPERATURE.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |