US3405216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making porous polyurethane foams
Assignee: Dow Chemical Co
•
Filing: 1964-03-30
•
Granted: 1968-10-08
•
Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Walter L Garrett
- 👤 Harold H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR MAKING AN OPEN CELL POLYURETHANE PRODUCT WHICH COMPRISES CONTACTING A FLEXIBLE POLYETHER POLYURETHANE FOAM PREPARED BY REACTION OF A POLYETHER POLYOL CONSISTING PREDOMINANTLY OF CHEMICALLY COMBINED PROPYLENE OXIDE UNITS AND HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 1800 AND 5800 AND CONTAINING FROM 2 TO 3 HYDROXYL GROUPS IN THE MOLECULE, AND A POLYISOCYANATE WITH AN AQUEOUS LIQUID SOLUTION OF AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF SOLUTIONS OF POTASSIUM PERMANGANATE AND SOLUTIONS OF CERIC SULFATE, MADE ACIDIC WITH SULFURIC ACID HAVING A CONCENTRATION OF SAID SALT BETWEEN ABOUT 0.1 WEIGHT PERCENT AND A SATURATED SOLUTION OF SAID SALT AT TEMPERATURES BETWEEN-10* AND 120*C. FOR A TIME SUFFICIENT TO APPRECIABLY INCREASE THE POROSITY OF THE FOAM BY DESTROYING MEMBRANES OF THE CELLS WHILE LEAVING LARGELY A SKELETAL NETWORK OF THE FOAM STRUCTURE.
Claim 2
Independent Claim
136 words
A METHOD FOR MAKING AN OPEN CELL POLYURETHANE PRODUCT WHICH COMPRISES CONTACTING A FLEXIBLE POLYETHER POLYURETHANE FOAM PREPARED BY REACTION OF A POLYETHER POLYOL CONSISTING PREDOMINANTLY OF CHEMICALLY COMBINED PROPYLENE OXIDE UNITS AND HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 1800 AND 5800 AND CONTAINING FROM 2 TO 3 HYDROXYL GROUPS IN THE MOLECULE, AND A POLYISOCYANATE WITH AN AQUEOUS LIQUID SOLUTION OF AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF SOLUTIONS OF POTASSIUM PERMANGANATE AND SOLUTIONS OF CERIC SULFATE, MADE ACIDIC WITH SULFURIC ACID HAVING A CONCENTRATION OF SAID SALT BETWEEN ABOUT 0.1 WEIGHT PERCENT AND A SATURATED SOLUTION OF SAID SALT AT TEMPERATURES BETWEEN-10* AND 120*C. FOR A TIME SUFFICIENT TO APPRECIABLY INCREASE THE POROSITY OF THE FOAM BY DESTROYING MEMBRANES OF THE CELLS WHILE LEAVING LARGELY A SKELETAL NETWORK OF THE FOAM STRUCTURE.
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |