US3562368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas release from cellulose casing by multiple perforations
Assignee: Continental Group Inc
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Filing: 1967-12-13
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Granted: 1971-02-09
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Expires: 1987-12-13
Abstract
Abstract A METHOD OF VENTING FLUIDS FROM ARTIFICIAL TUBULAR CASINGS MADE BY THE VISCOSE PROCESS COMPRISES PERFORATING MULTIPLE SMALL HOLES IN A DISCRETE AREA OF THE CELLULOSE XANTHATE CASING DURING REGENERATION THEROF. THE HOLES ARE LATER FILLED WITH A SUITABLE LIQUID, GEL-FORMING DOPE (E.G., A 16% CELLULOSE, LOW DEGREE OF POLYMERIZATION, VISCOSE) OR WITH A SOLID SUSPENSION OR SLURRY OF WATER SWELLABLE MATERIAL (E.G., LOW ALKALI UNREGENERATED CELLULOSE XANTHATE) IN A WATER-MISCIBLE ORGANIC SOLVENT (E.G., ACETONE) OR BY SECURING A SOLID FILM PATCH SUCH AS CELLULOSE ONTO THE GEL CASING WITH AN ADHESIVE SUCH AS ALPHA-CYANOMETHYL ACRYLATE MONOMER.
Inventors
- 👤 Douglas J Bridgeford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
A; A22; A22C; A22C13/00; A22C13/0003; Y; Y10; Y10T; Y10T428/00; Y10T428/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |