Patent US1818467A successfully refreshed from Google Patents.
Patent US3342922A successfully refreshed from Google Patents.
US3342922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing re-expandable foam
Assignee: Dow Chemical Co
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Filing: 1963-10-09
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Granted: 1967-09-19
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Expires: 1983-10-09
Abstract
No abstract record available.
Inventors
- 👤 Karpovich John
- 👤 Willard F Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:37
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; Y; Y10; Y10S; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A METHOD OF PREPARING A RE-EXPANDED SYNTHETIC RESINOUS FOAM COMPRISING COMPRESSING A SYNTHETIC RESINOUS FOAM AT A TEMPERATURE BELOW THE SECOND ORDER TRANSITION POINT OF THE SYNTHETIC RESINOUS FOAM, THE SYNTHETIC RESINOUS FOAM BEING SELECTED FROM THE GROUP CONSISTING OF POLYURETHANE FOAMS AND EPOXY RESIN FOAMS WHICH EXHIBIT IN THEIR STRESS STRAIN CURVES A YIELD POINT, THE FOAMS BEING WITHOUT ADHESION PROMOTING ADDITIVES, THE COMPRESSION BEING UNDER A PRESSURE OF FROM ABOUT 1 TO ABOUT 50 TONS PER SQUARE INCH FOR A PERIOD OF TIME SUFFICIENT THAT THE FOAM DOES NOT RE-EXPAND WHEN THE PRESSURE IS REMOVED, AND SUBSEQUENTLY RE-EXPANDING THE FOAM BY TREATMENT WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF WATER, GLACIAL ACETIC ACID, METHANOL, METHYL CHLORIDE, AQUEOUS SOLUTIONS OF PHENOL, FORMIC ACID, DIMETHYL FORMAMIDE, ETHANOL, CHLOROBENZENE, DIETHYLENE GLYCOL, ETHYLENE GLYCOL, MINERAL OIL, AIR HAVING A TEMPERATURE OF AT LEAST 120*C. AND VAPORS OF THE SOLVENTS HEREINBEFORE DELINEATED.
Claim 2
Independent Claim
151 words
A METHOD OF PREPARING A RE-EXPANDED SYNTHETIC RESINOUS FOAM COMPRISING COMPRESSING A SYNTHETIC RESINOUS FOAM AT A TEMPERATURE BELOW THE SECOND ORDER TRANSITION POINT OF THE SYNTHETIC RESINOUS FOAM, THE SYNTHETIC RESINOUS FOAM BEING SELECTED FROM THE GROUP CONSISTING OF POLYURETHANE FOAMS AND EPOXY RESIN FOAMS WHICH EXHIBIT IN THEIR STRESS STRAIN CURVES A YIELD POINT, THE FOAMS BEING WITHOUT ADHESION PROMOTING ADDITIVES, THE COMPRESSION BEING UNDER A PRESSURE OF FROM ABOUT 1 TO ABOUT 50 TONS PER SQUARE INCH FOR A PERIOD OF TIME SUFFICIENT THAT THE FOAM DOES NOT RE-EXPAND WHEN THE PRESSURE IS REMOVED, AND SUBSEQUENTLY RE-EXPANDING THE FOAM BY TREATMENT WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF WATER, GLACIAL ACETIC ACID, METHANOL, METHYL CHLORIDE, AQUEOUS SOLUTIONS OF PHENOL, FORMIC ACID, DIMETHYL FORMAMIDE, ETHANOL, CHLOROBENZENE, DIETHYLENE GLYCOL, ETHYLENE GLYCOL, MINERAL OIL, AIR HAVING A TEMPERATURE OF AT LEAST 120*C. AND VAPORS OF THE SOLVENTS HEREINBEFORE DELINEATED.
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |