Patent DE932077C successfully refreshed from Google Patents.
US2558634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper impregnating or saturating composition
Assignee: EIDP Inc
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Filing: 1949-02-09
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Granted: 1951-06-26
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Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 Jay J Uber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H17/21; D21H17/23
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
THE METHOD OF PREPARING STOCK FOR SHOE MIDSOLES, COUNTERS AND THE LIKE WHICH COMPRISES MIXING FROM 1 TO 9 PARTS OF RUBBER IN LATEX FORM WITH 1 PART OF A WATER-SOLUBLE SODIUM SALT OF LIGNIN, PRECIPITATING FREE UNCOAGULATED LIGNIN FROM THE MIXTURE BY ADDING AN AMMONIUM SALT TO THE MIXTURE IN AMOUNT BETWEEN 80% AND 360% BASED ON THE WEIGHT OF THE CAUSTIC SODA USED TO DISSOLVE THE LIGNIN, IMPREGNATING A WET WEB OF BEATEN CELLULOSE FIBERS WITH THE DISPERSION AND THEREAFTER HEATING THE IMPREGNATED WEB UNTIL THE LIGNIN IS PRECIPITATED AS FREE COLLOIDAL LIGNIN AND AMMONIA IS DRIVEN OFF.
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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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |