Patent US4058231A successfully refreshed from Google Patents.
US2733221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded resin and method for
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
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Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A METHOD OF FORMING AN EXPANDED, CELLULAR, HARD, RESINOUS PRODUCT WHICH COMPRISES ADMIXING 100 PARTS OF A LIQUID, ACID-CURABLE PHENOL-ALDEHYDE PARTIAL REACTION PRODUCT CONTAINING ABOUT 75% TO ABOUT 90% RESIN SOLIDS BY WEIGHT, ABOUT 19 TO ABOUT 22 PARTS OF AN AQUEOUS ACIDIC SOLUTION, AND A METAL ABOVE HYDROGEN IN THE ELECTROMOTIVE SERIES IN AN AMOUNT SUFFICIENT TO PRODUCE AN AMOUNT OF GAS WHEN REACTED WITH SAID AQUEOUS ACIDIC SOLUTION EQUIVALENT TO THE AMOUNT OF GAS PRODUCED WHEN FROM ABOUT 1.2 TO ABOUT 12 PARTS OF IRON IS REACTED WITH ABOUT 18 TO ABOUT 22 PARTS OF SULFURIC ACID HAVING A CONCENTRATION BETWEEN 50% 66* BE. SULFURIC ACID AND 66* BE. SULFURIC ACID, THE AQUEOUS ACIDIC SOLUTION BEING EQUIVALENT IN THE RATE OF FORMATION OF GAS WITH IRON TO SAID SULFURIC ACID SOLUTION.
Claim 2
Independent Claim
133 words
A METHOD OF FORMING AN EXPANDED, CELLULAR, HARD, RESINOUS PRODUCT WHICH COMPRISES ADMIXING 100 PARTS OF A LIQUID, ACID-CURABLE PHENOL-ALDEHYDE PARTIAL REACTION PRODUCT CONTAINING ABOUT 75% TO ABOUT 90% RESIN SOLIDS BY WEIGHT, ABOUT 19 TO ABOUT 22 PARTS OF AN AQUEOUS ACIDIC SOLUTION, AND A METAL ABOVE HYDROGEN IN THE ELECTROMOTIVE SERIES IN AN AMOUNT SUFFICIENT TO PRODUCE AN AMOUNT OF GAS WHEN REACTED WITH SAID AQUEOUS ACIDIC SOLUTION EQUIVALENT TO THE AMOUNT OF GAS PRODUCED WHEN FROM ABOUT 1.2 TO ABOUT 12 PARTS OF IRON IS REACTED WITH ABOUT 18 TO ABOUT 22 PARTS OF SULFURIC ACID HAVING A CONCENTRATION BETWEEN 50% 66* BE. SULFURIC ACID AND 66* BE. SULFURIC ACID, THE AQUEOUS ACIDIC SOLUTION BEING EQUIVALENT IN THE RATE OF FORMATION OF GAS WITH IRON TO SAID SULFURIC ACID SOLUTION.
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) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |