US2950217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnation process
Assignee: EIDP Inc
•
Filing: 1956-11-13
•
Granted: 1960-08-23
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Expires: 1976-11-13
Abstract
No abstract record available.
Inventors
- 👤 Lichtblau Ellis Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:06
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/065; C08J2301/00; C08J2301/08; C08J2301/22; C08J2301/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR STORING A PIGMENT REGENERATED CELLULOSE PELLICULAR ARTICLE IN THE GEL STATE WHICH COMPRISES FIRST TREATING SAID ARTICLE WITH A SOLUTION CONTAINING FROM 0.2% TO 0.5% OF A QUATERNARY AMMONIUM HALIDE AT A PH BETWEEN 7 AND 8 FOR A TIME SUFFICENT TO IMPREGNATE SAID ARTICLE WITH AT LEAST 0.2% BASED ON THE DRY WEIGHT OF THE ARTICLE, OF SAID QUATERNARY AMMONIUM HALIED, AND, THEREAFTER, MAINTAINING SAID ARTICLE IN CONTACT WITH A QUATERNARY AMMONIUM HALIDE FOR AN EXTENDED PERIOD OF TIME.
Claim 2
Dependent Claim
83 words
A PROCESS FOR STORING A PIGMENT REGENERATED CELLULOSE PELLICULAR ARTICLE IN THE GEL STATE WHICH COMPRISES FIRST TREATING SAID ARTICLE WITH A SOLUTION CONTAINING FROM 0.2% TO 0.5% OF A QUATERNARY AMMONIUM HALIDE AT A PH BETWEEN 7 AND 8 FOR A TIME SUFFICENT TO IMPREGNATE SAID ARTICLE WITH AT LEAST 0.2% BASED ON THE DRY WEIGHT OF THE ARTICLE, OF SAID QUATERNARY AMMONIUM HALIED, AND, THEREAFTER, MAINTAINING SAID ARTICLE IN CONTACT WITH A QUATERNARY AMMONIUM HALIDE FOR AN EXTENDED PERIOD OF TIME.
References Cited (Backward Citations)
US2004476A
Cited
US2123154A
Cited
US2040061A
Cited
US2432085A
Cited
US2680057A
Cited
US2741534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |