Patent US3817983A successfully refreshed from Google Patents.
US3817983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process using diverse types of cellulose for preparing viscose
Assignee: Shawmut Capital Corp
•
Filing: 1972-05-01
•
Granted: 1974-06-18
•
Expires: 1992-05-01
Abstract
Abstract In a viscose manufacturing process, the additional steps of using diverse forms of cellulosic materials by ball-milling these diverse forms of cellulosic materials and subsequently adding the ball-milled material to the alkali cellulose which is prepared as an intermediate during the process of manufacturing viscose, in an amount up to about 50 percent by weight based on the combined weight of the ball-milled cellulosic material added plus the weight of the cellulose content of the alkali cellulose present.
Inventors
- 👤 Boreck J Ten
- 👤 D Laurance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:37
CPC Classifications
C; C08; C08B; C08B9/00; C08B1/00; C08B1/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
The process of claim 1 wherein the ball-milled cellulosic material is added to the alkali cellulose by broad-casting the cellulosic material over the surface of thE alkali cellulose.
Claim 2
Dependent Claim
42 words
The process of claim 1 wherein the ball-milled cellulosic material is added in the amount of about 15 to 50 weight percent based on the combined weight of the ball-milled cellulosic material added plus the cellulose content of the alkali cellulose present.
Claim 3
Dependent Claim
17 words
The process of claim 1 including the step of comminuting the cellulosic material to be ball milled.
Claim 4
Dependent Claim
17 words
The process of claim 1 including the step of purifying the cellulosic material to be ball milled.
Claim 5
Dependent Claim
41 words
The process of claim 1 wherein the ball-milled cellulosic material is added in an amount up to about 50 weight percent based on the combined weight of the ball-milled cellulose material added plus the cellulose content of the alkali cellulose present.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the ball-milled material is added to the alkali cellulose prior to aging.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the ball-milled material is added to aged alkali cellulose.
Claim 8
Dependent Claim
15 words
A process wherein the resulting viscose of claim 1 is molded into a sponge product.
Claim 9
Dependent Claim
19 words
A process wherein the resulting viscose of claim 1 is filteed, deaerated, aged, and then cast into a film.
Claim 10
Dependent Claim
19 words
A process wherein the resulting viscose of claim 1 is filtered, deaerated, aged, and then formed into a fiber.
References Cited (Backward Citations)
US2087016A
Cited
US2172109A
Cited
US2184586A
Cited
US2337928A
Cited
GB552681A
Cited
US2680737A
Cited
US3584089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |