US3379546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the surface characteristics of cellulose hydrate films
Assignee: Evonik Operations GmbH
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Filing: 1964-10-21
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Granted: 1968-04-23
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Expires: 1984-10-21
Abstract
No abstract record available.
Inventors
- 👤 Debus Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:50
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J2301/00; C08J2301/06; C08J2479/00; Y; Y10; Y10S; Y10S516/00; Y10S516/922
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
IN A METHOD OF IMPROVING THE SURFACE CHARACTERISTICS OF CELLULOSE HYDRATE FILMS IN WHICH SUCH FILMS ARE PASSED THROUGH AN AQUEOUS BATH CONTAINING A CATIONICALLY ACTIVE FILM PROCESSING AGENT, THE STEP OF INCORPORATING IN SUCH BATH AS AN ANTI-BLOCKING AGENT AN EFFECTIVE AMOUNT OF A STABLE AQUEOUS SUSPENSION OF PYROGENIC SILICA AEROGEL HAVING A PARTICLE SIZE OF LESS THAN THAN 0.15U OBTAINED BY INTENSIVELY DISPERSING THE SILICA AEROGEL IN DRY FORM IN AN AQUEOUS SOLUTION OF POLYETHYLENE IMINE IN SUCH PROPORTIONS THAT THE AQUEOUS SUSPENSION CONTAINS 8 TO 20A% BY WEIGHT OF SILICA AEROGEL AND 1.5 TO 4% BY WEIGHT OF POLYETHYLENE IMINE, SAID BATH ALSO CONTAINING A SOFENTING AGENT FOR SAID CELLULOSE HYDRATE FILM.
Claim 2
Dependent Claim
115 words
IN A METHOD OF IMPROVING THE SURFACE CHARACTERISTICS OF CELLULOSE HYDRATE FILMS IN WHICH SUCH FILMS ARE PASSED THROUGH AN AQUEOUS BATH CONTAINING A CATIONICALLY ACTIVE FILM PROCESSING AGENT, THE STEP OF INCORPORATING IN SUCH BATH AS AN ANTI-BLOCKING AGENT AN EFFECTIVE AMOUNT OF A STABLE AQUEOUS SUSPENSION OF PYROGENIC SILICA AEROGEL HAVING A PARTICLE SIZE OF LESS THAN THAN 0.15U OBTAINED BY INTENSIVELY DISPERSING THE SILICA AEROGEL IN DRY FORM IN AN AQUEOUS SOLUTION OF POLYETHYLENE IMINE IN SUCH PROPORTIONS THAT THE AQUEOUS SUSPENSION CONTAINS 8 TO 20A% BY WEIGHT OF SILICA AEROGEL AND 1.5 TO 4% BY WEIGHT OF POLYETHYLENE IMINE, SAID BATH ALSO CONTAINING A SOFENTING AGENT FOR SAID CELLULOSE HYDRATE FILM.
Claim 3
Dependent Claim
57 words
AN ANTIBLOCKING AGENT FOR USE IN BATHS EMPLOYED FOR THE PROCESSING OF CELLULOSE HYDRATE FILMS CONSISTING ESSENTIALLY OF A STABLE AQUEOUS DISPERSION CONTAINING 8 TO 20% BY WEIGHT OF DISPERSED PYROGENIC SILICA HAVING A PARTICLE SIZE OF LESS THAN 0.15U AND 1.5 TO 4% BY WEIGHT OF POLYETHYLENE IMINE DISSOLVED IN THE AQUEOUS PHASE OF SUCH DISPERSION.
Claim 4
Dependent Claim
57 words
AN ANTIBLOCKING AGENT FOR USE IN BATHS EMPLOYED FOR THE PROCESSING OF CELLULOSE HYDRATE FILMS CONSISTING ESSENTIALLY OF A STABLE AQUEOUS DISPERSION CONTAINING 8 TO 20% BY WEIGHT OF DISPERSED PYROGENIC SILICA HAVING A PARTICLE SIZE OF LESS THAN 0.15U AND 1.5 TO 4% BY WEIGHT OF POLYETHYLENE IMINE DISSOLVED IN THE AQUEOUS PHASE OF SUCH DISPERSION.
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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |