US3125541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for leaching a polyurethane
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
•
Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/38; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD FOR LEACHING A POLYURETHANE FOAM COMPRISING CONTACTING THE CELL WALLS OF A FOAM PREPARED BY REACTING AN ORGANIC POLYISOCYAPATE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYESTERS AND POLYETHERS FOR A TIME SUFFICIENT TO EXERT A LEACHING EFFECT UPON SAID CELL WALLS AND TO REMOVE SAID CELL WALLS, WITH A LEACHING COMPOSITION CONSISTING ESSENTIALLY OF AN ALKALINE SOLUTION AND A HYDROXYL SUBSTITUTED ALIPHATIC HYDROCARBON, SAID ALIPHATIC HYDROCARBON BEING PRESENT IN A RATIO OF NO MORE THAN ONE PART BY WEIGHT FOR EACH PART BY WEIGHT OF SAID ALKALINE SOLUTION.
Claim 2
Independent Claim
93 words
A METHOD FOR LEACHING A POLYURETHANE FOAM COMPRISING CONTACTING THE CELL WALLS OF A FOAM PREPARED BY REACTING AN ORGANIC POLYISOCYAPATE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYESTERS AND POLYETHERS FOR A TIME SUFFICIENT TO EXERT A LEACHING EFFECT UPON SAID CELL WALLS AND TO REMOVE SAID CELL WALLS, WITH A LEACHING COMPOSITION CONSISTING ESSENTIALLY OF AN ALKALINE SOLUTION AND A HYDROXYL SUBSTITUTED ALIPHATIC HYDROCARBON, SAID ALIPHATIC HYDROCARBON BEING PRESENT IN A RATIO OF NO MORE THAN ONE PART BY WEIGHT FOR EACH PART BY WEIGHT OF SAID ALKALINE SOLUTION.
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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) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |