US2736631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of organic derivatives of cellulose to prevent acid-fading
Assignee: Celanese Corp
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Filing: 1952-04-04
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Granted: 1956-02-28
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Expires: 1972-04-04
Abstract
No abstract record available.
Inventors
- 👤 William J Myles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:33
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/192; D06M13/224; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
DYED CELLULOSE ACETATE TEXTILE MATERIAL DYED WITH A DYESTUFF NORMALLY TENDING TO FADE, ON SAID MATERIAL, ON EXPOSURE TO ACID FUMES AND HAVING INCORPORATED THEREIN, AS AN ACID FADING INHIBITOR, DI-(DIETHYLAMINOETHYL) PHTHALATE.
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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |