US3883630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of synthetic fibrils
Assignee: Solvay SA
•
Filing: 1972-09-06
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Granted: 1975-05-13
•
Expires: 1992-09-06
Abstract
Abstract A process for recovering synthetic polymer fibrils which are in the presence of vapors of an organic solvent, by depositing the fibrils on a moving porous support in a closed vessel and continuously extracting the solvent vapors from the vessel by suction.
Inventors
- 👤 Carlo Raganato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:43
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/72; D04H1/724; C; C08; C08J; C08J11/00; C08J11/02; D01; D01D; D01D5/00; D01D5/11; D04H13/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
27 words
IN A PROCESS FOR THE RECOVERY OF SYNTHETIC POLYMER FIBRILS WHICH ARE IN THE PRESENCE OF VAPORS OF AN ORGANIC SOLVENT THE IMPROVEMENT COMPRISING THE STEPS OF
Claim 2
Dependent Claim
27 words
IN A PROCESS FOR THE RECOVERY OF SYNTHETIC POLYMER FIBRILS WHICH ARE IN THE PRESENCE OF VAPORS OF AN ORGANIC SOLVENT THE IMPROVEMENT COMPRISING THE STEPS OF
Claim 3
Dependent Claim
78 words
PASSING A MOVABLE POROUS SUPPORT THROUGH A CLOSED VESSEL WHICH IS MAINTAINED FREE OF AIR AND CONTAINS WATER VAPORS WHICH WATER VAPORS ARE OF A LIQUID WHICH IS IMMISCIBLE WITH THE ORGANIC SOLVENT AND INERT IN RELATION TO THE POLYMER OF WHICH THE FIBRILS ARE COMPOUND, SAID WATER VAPORS ACTING TO REDUCE CONDENSATION OF THE SOLVENT VAPORS IN THE CLOSED VESSEL AND HAVING A PARTIAL PRESSURE BETWEEN 5% AND 80% OF THE TOTAL PRESSURE PREVAILING IN THE VESSEL,
Claim 4
Dependent Claim
78 words
PASSING A MOVABLE POROUS SUPPORT THROUGH A CLOSED VESSEL WHICH IS MAINTAINED FREE OF AIR AND CONTAINS WATER VAPORS WHICH WATER VAPORS ARE OF A LIQUID WHICH IS IMMISCIBLE WITH THE ORGANIC SOLVENT AND INERT IN RELATION TO THE POLYMER OF WHICH THE FIBRILS ARE COMPOUND, SAID WATER VAPORS ACTING TO REDUCE CONDENSATION OF THE SOLVENT VAPORS IN THE CLOSED VESSEL AND HAVING A PARTIAL PRESSURE BETWEEN 5% AND 80% OF THE TOTAL PRESSURE PREVAILING IN THE VESSEL,
Claim 5
Dependent Claim
28 words
INTRODUCING THE FIBRILS AND ORGANIC SOLVENT VAPORS INTO THE VESSEL AND DEPOSITING THE FIBRILS IN THE FORM OF A SHEET ONTO THE MOVABLE POROUS SUPPORT IN THE VESSEL,
Claim 6
Dependent Claim
28 words
INTRODUCING THE FIBRILS AND ORGANIC SOLVENT VAPORS INTO THE VESSEL AND DEPOSITING THE FIBRILS IN THE FORM OF A SHEET ONTO THE MOVABLE POROUS SUPPORT IN THE VESSEL,
Claim 7
Dependent Claim
28 words
introducing the fibrils and organic solvent vapors into the vessel and depositing the fibrils in the form of a sheet onto the movable porous support in the vessel;
Claim 8
Dependent Claim
28 words
introducing the fibrils and organic solvent vapors into the vessel and depositing the fibrils in the form of a sheet onto the movable porous support in the vessel;
Claim 9
Dependent Claim
19 words
A process according to claim 1, wherein the pressure prevailing in the closed vessel is higher than atmospheric pressure.
Claim 10
Dependent Claim
32 words
A process according to claim 1, wherein the temperature prevailing in the vessel is higher than the condensation temperature of the organic solvent vapors under the pressure conditions prevailing in the vessel.
Claim 11
Dependent Claim
11 words
continuously extracting the solvent vapors from the vessel by suction; and
Claim 12
Dependent Claim
11 words
continuously extracting the solvent vapors from the vessel by suction; and
Claim 13
Dependent Claim
11 words
CONTINUOUSLY EXTRACTING THE SOLVENT VAPORS FROM THE VESSEL BY SUCTION, AND
Claim 14
Dependent Claim
11 words
CONTINUOUSLY EXTRACTING THE SOLVENT VAPORS FROM THE VESSEL BY SUCTION, AND
Claim 15
Dependent Claim
40 words
CONTINUOUS EXTRACTING FROM THE VESSEL THE SHEET OF FIBRILS FORMED IN THE VESSEL BY PASSING IT THROUGH A HYDRAULIC SEAL CONSTITUTED BY WATER IN THE FORM OF A LIQUID PHASE TO REMOVE ANY REMAINING TRACES OF SOLVENT FROM THE FIBRILS.
Claim 16
Dependent Claim
40 words
CONTINUOUS EXTRACTING FROM THE VESSEL THE SHEET OF FIBRILS FORMED IN THE VESSEL BY PASSING IT THROUGH A HYDRAULIC SEAL CONSTITUTED BY WATER IN THE FORM OF A LIQUID PHASE TO REMOVE ANY REMAINING TRACES OF SOLVENT FROM THE FIBRILS.
Claim 17
Dependent Claim
40 words
continuous extracting from the vessel the sheet of fibrils formed in the vessel by passing it through a hydraulic seal constituted by water in the form of a liquid phase to remove any remaining traces of solvent from the fibrils.
Claim 18
Dependent Claim
40 words
continuous extracting from the vessel the sheet of fibrils formed in the vessel by passing it through a hydraulic seal constituted by water in the form of a liquid phase to remove any remaining traces of solvent from the fibrils.
Claim 19
Dependent Claim
31 words
A process according to claim 1, wherein the temperature prevailing inside the vessel is lower than the boiling temperature of the liquid water under the pressure conditions prevailing in the vessel.
Claim 20
Dependent Claim
35 words
A process according to claim 1, wherein the temperature prevailing in the vessel is between 50* and 100*C, and the pressure prevailing in the closed vessel is sufficiently high to prevent the water from boiling.
Claim 21
Dependent Claim
16 words
A process according to claim 1, wherein the fibrils are continuous and form a three-dimensional network.
Claim 22
Dependent Claim
20 words
A process according to claim 1, wherein the fibrils are discontinuous and have a length varying from 1mm to 5mm.
Claim 23
Dependent Claim
29 words
A process according to claim 1, wherein the fibrils are produced from a polymer selected from the group comprising the polyolefins, polyamides, polyesters, polyurethanes, polycarbonates, vinyl and acrylic polymers.
Claim 24
Dependent Claim
32 words
A process according to claim 1, wherein the organic solvent is a product selected from the group formed by the aliphatic, alicyclic, and aromatic hydrocarbons, halogenated solvents, alcohols, ketones, esters, and ethers.
Claim 25
Dependent Claim
20 words
A process according to claim 1, wherein the polymer of which the fibrils are composed is a high density polyethylEne.
Claim 26
Dependent Claim
12 words
A process according to claim 10, wherein the organic solvent is hexane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |