Patent US4790810A successfully refreshed from Google Patents.
US4096289A
Expired / Lapsed
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Electrostatic deposition of swellable, modified cellulose ether on water wet hydrophilic substrate
Assignee: Hoechst AG
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Filing: 1976-12-14
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Granted: 1978-06-20
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Expires: 1996-12-14
Abstract
Abstract Process for the transformation of comminuted and modified cellulose ether swellable with water, into a material that may easily be further processed and may thus be used without difficulty in particular in the production of hygienic pads, napkins, bandages, tampons, wrapping papers, insulating material, household papers and similar articles. In said process the modified cellulose ether is attached by electrostatic flocking to at least one surface of a web-shaped hydrophilic support that has been wetted with water and the support is dried.
Inventors
- 👤 Ehrenfried Nischwitz
- 👤 Klaus Uhl
- 👤 Helmut Lask
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:46
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/34; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A process for the transformation of comminuted cellulose ether, which has been rendered at least largely water-insoluble by modification but has remained highly swellable with water, into an easily usable material, a process in which the modified cellulose ether is attached to at least one surface of a web-shaped hydrophilic support that has been wetted with water and the support is dried, the process comprising the modified cellulose ether attached to the support by electrostatic flocking.
Claim 2
Dependent Claim
76 words
A process for the transformation of comminuted cellulose ether, which has been rendered at least largely water-insoluble by modification but has remained highly swellable with water, into an easily usable material, a process in which the modified cellulose ether is attached to at least one surface of a web-shaped hydrophilic support that has been wetted with water and the support is dried, the process comprising the modified cellulose ether attached to the support by electrostatic flocking.
Claim 3
Dependent Claim
33 words
A process according to claim 1, in which the modified cellulose ether is used in the form of fibres having an average length of 0.05 to 1 mm, preferably 0.05 to 0.3 mm.
Claim 4
Dependent Claim
32 words
A process according to claim 1, in which the quantity of cellulose ether attached to the support is up to 100 g/m 2 , preferably about 15 to 30 g/m 2 .
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |