US3047538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of urea-formaldehyde foamed resin
Assignee: Kimberly Clark Tissue Co
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Filing: 1958-06-16
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Granted: 1962-07-31
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Expires: 1978-06-16
Abstract
No abstract record available.
Inventors
- 👤 Henry W Steinmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:14
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08J2361/00; C08J2361/20; C08J2361/22; C08J2361/24; Y; Y10; Y10S; Y10S521/00; Y10S521/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS OF PREPARING A UREA-THIOUREA-FORMALDEHYDE PREPOLYMER PARTICULARLY ADAPTED FOR FOAMING AND SUBSEQUENT CONVERSION INTO A PAPERMAKING MATERIAL WHICH COMPRISES CONDENSING AT A PH OF FROM 5-7 AN ADMIXTURE OF THIORREA AND UREA, THE THIOUREA REPRESENTING APPROXIMATELY 5 MOL PERCENT OF SUCH ADMIXTURE, WITH FORMALDEHYDE IN THE PRESENCE OF PYRIDINE IN AN AMOUNT CONSTITUTING ABOUT 10 PERCENT BY WEIGHT OF THE CONDENSING MIXTURE, THE MIXED UREAS AND TH FORMALDEHYDE BEING IN A MOLAR RATIO OF APPROXIMATELY 1 TO 2, AND REMOVING SUFFICIENT DISTILLATE FROM THE CONDENSING MIXTURE TO PROVIDE A RESIDUAL SOLUTION CONTAINING FROM 55 TO 75 PERCENT BY WEIGHT OF SOLIDS.
Claim 2
Dependent Claim
102 words
A PROCESS OF PREPARING A UREA-THIOUREA-FORMALDEHYDE PREPOLYMER PARTICULARLY ADAPTED FOR FOAMING AND SUBSEQUENT CONVERSION INTO A PAPERMAKING MATERIAL WHICH COMPRISES CONDENSING AT A PH OF FROM 5-7 AN ADMIXTURE OF THIORREA AND UREA, THE THIOUREA REPRESENTING APPROXIMATELY 5 MOL PERCENT OF SUCH ADMIXTURE, WITH FORMALDEHYDE IN THE PRESENCE OF PYRIDINE IN AN AMOUNT CONSTITUTING ABOUT 10 PERCENT BY WEIGHT OF THE CONDENSING MIXTURE, THE MIXED UREAS AND TH FORMALDEHYDE BEING IN A MOLAR RATIO OF APPROXIMATELY 1 TO 2, AND REMOVING SUFFICIENT DISTILLATE FROM THE CONDENSING MIXTURE TO PROVIDE A RESIDUAL SOLUTION CONTAINING FROM 55 TO 75 PERCENT BY WEIGHT OF SOLIDS.
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) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |