US3171820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reticulated polyurethane foams and process for their production
Assignee: Kimberly Clark Tissue Co
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Filing: 1964-02-17
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Granted: 1965-03-02
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Robert A Volz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/38; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; Y; Y10; Y10S; Y10S261/00; Y10S261/72; Y10S273/00; Y10S273/08; Y10S297/00; Y10S297/01; Y10S521/00; Y10S521/918; Y10S55/00; Y10S55/13; Y10S55/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A 3-DIMENSIONAL NETWORK OF INTERCONNECTING STRANDS OF POLYURETHANE RESIN FORMED BY THE REACTION OF AN ORGANIC POLYISOCYANATE WITH A POLYMER SELECTED FROM AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF POLYALKYLENE ETHER GLYCOLS, POLYALKYLENE ETHER AMINES PRODUCED BY THE REACTION OF ALKYLENEOXIDES WITH POLYAMINES AND POLYESTERS PRODUCED BY THE REACTION OF POLYHYDRIC ALCOHOLS WITH POLYCARBOXYLIC ACIDS, SAID STRANDS BEING INTEGRALLY INTERCONNECTED BY THICKENED NEXUS AT SPACED APART POINTS SO AS TO FORM THE ISOTROPIC SKELETAL OUTLINE OF A MULTITUDE OF POLYHEDRONS WHOSE FACES ARE POLYGONAL, ARE COMMON TO A POLYHEDRON ADJACENT THERETO AND ARE OPEN AND FREE FROM MEMBRANEOUS POLYURETHANE RESIN, SAID NETWORK BEING SUBSTANTIALLY FREE FROM PERMEATOIDALLY DEGRADED STRANDS AND NEXUS.
Claim 2
Dependent Claim
113 words
A 3-DIMENSIONAL NETWORK OF INTERCONNECTING STRANDS OF POLYURETHANE RESIN FORMED BY THE REACTION OF AN ORGANIC POLYISOCYANATE WITH A POLYMER SELECTED FROM AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF POLYALKYLENE ETHER GLYCOLS, POLYALKYLENE ETHER AMINES PRODUCED BY THE REACTION OF ALKYLENEOXIDES WITH POLYAMINES AND POLYESTERS PRODUCED BY THE REACTION OF POLYHYDRIC ALCOHOLS WITH POLYCARBOXYLIC ACIDS, SAID STRANDS BEING INTEGRALLY INTERCONNECTED BY THICKENED NEXUS AT SPACED APART POINTS SO AS TO FORM THE ISOTROPIC SKELETAL OUTLINE OF A MULTITUDE OF POLYHEDRONS WHOSE FACES ARE POLYGONAL, ARE COMMON TO A POLYHEDRON ADJACENT THERETO AND ARE OPEN AND FREE FROM MEMBRANEOUS POLYURETHANE RESIN, SAID NETWORK BEING SUBSTANTIALLY FREE FROM PERMEATOIDALLY DEGRADED STRANDS AND NEXUS.
Claim 3
Independent Claim
106 words
THE METHOD OF MAKING A 3-DIMENSIONAL NETWORK OF INTERCONNECTING STRANDS OF POLYURETHANE RESIN WHICH COMPRISES SUBJECTING A FOAMED OPEN CELL CELLULAR STRUCTURE FORMED OF A HYDROLYZABLE POLYURETHANE RESIN TO THE HYDROLYTIC ACTION OF WATER IN THE PRESENCE OF AN ALKALI-METAL HYDROXIDE AS HYDROLYSIS CATALYST IN SUFFICIENT CONCENTRATION TO ACTIVATE HYDROLYSIS AT A TEMPERATURE OF AT LEAST 20*C. AND TO EFFECT IN THE FOAM A WEIGHT LOSS OF FROM 0.5% TO ABOUT 41.8%, AS THE RESULT OF THE REMOVAL OF A PORTION OF THE FOAM, PRIMARILY THE CELL FACES THEREOF, ARRESTING FURTHER HYDROLYTIC ACTION ON SAID FOAM, DRYING THE TREATED FOAM AND RECOVERING A SKELETAL NETWORK STRUCTURE.
Claim 4
Independent Claim
106 words
THE METHOD OF MAKING A 3-DIMENSIONAL NETWORK OF INTERCONNECTING STRANDS OF POLYURETHANE RESIN WHICH COMPRISES SUBJECTING A FOAMED OPEN CELL CELLULAR STRUCTURE FORMED OF A HYDROLYZABLE POLYURETHANE RESIN TO THE HYDROLYTIC ACTION OF WATER IN THE PRESENCE OF AN ALKALI-METAL HYDROXIDE AS HYDROLYSIS CATALYST IN SUFFICIENT CONCENTRATION TO ACTIVATE HYDROLYSIS AT A TEMPERATURE OF AT LEAST 20*C. AND TO EFFECT IN THE FOAM A WEIGHT LOSS OF FROM 0.5% TO ABOUT 41.8%, AS THE RESULT OF THE REMOVAL OF A PORTION OF THE FOAM, PRIMARILY THE CELL FACES THEREOF, ARRESTING FURTHER HYDROLYTIC ACTION ON SAID FOAM, DRYING THE TREATED FOAM AND RECOVERING A SKELETAL NETWORK 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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |