US3118859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of formaldehyde polymers
Assignee: Houilleres du Bassin du Nord et du Pas de Calais
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Filing: 1960-12-21
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Granted: 1964-01-21
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Expires: 1980-12-21
Abstract
No abstract record available.
Inventors
- 👤 Delassus Marcel
- 👤 Vasseur Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR THE PRODUCTION OF A HIGH ORDER FORMALDEHYDE POLYMER OF THE GENERAL FORMULA HO(CH2O)NH WHEREIN N IS GREATER THAN 100, SAID PROCESS COMPRISING MIXING A CONCENTRATED AQUEOUS SOLUTION OF FORMALDEHYDE WITH A DRY, SOLID, HIGH ORDER FORMALDEHYDE POLYMER, OF THE GENERAL FORMULA HO(CH2O)NH IN WHICH N IS AN INTEGER GREATER THAN 100, THE QUANTITY OF ADDED POLYMER BEING AT LEAST EQUAL TO 100% BY WEIGHT OF FORMALDEHYDE PRESENT IN THE SOLUTION, TO FORM A MOIST POWDER MIXTURE HAVING A WATER CONTENT OF LESS THAN 30% BY WEIGHT, CONTINUING MIXTURE OF THE MIXTURE AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 40*C., UNTIL POLYMERIZATION OF THE FORMALDEHYDE IS SUBSTANTIALLY COMPLETE, AND DRYING THE MIXTURE TO FORM A GRANULAR FORMALDEHYDE POLYMER HAVING A CH2O CONTENT OF AT LEAST 99%.
Claim 2
Dependent Claim
130 words
A PROCESS FOR THE PRODUCTION OF A HIGH ORDER FORMALDEHYDE POLYMER OF THE GENERAL FORMULA HO(CH2O)NH WHEREIN N IS GREATER THAN 100, SAID PROCESS COMPRISING MIXING A CONCENTRATED AQUEOUS SOLUTION OF FORMALDEHYDE WITH A DRY, SOLID, HIGH ORDER FORMALDEHYDE POLYMER, OF THE GENERAL FORMULA HO(CH2O)NH IN WHICH N IS AN INTEGER GREATER THAN 100, THE QUANTITY OF ADDED POLYMER BEING AT LEAST EQUAL TO 100% BY WEIGHT OF FORMALDEHYDE PRESENT IN THE SOLUTION, TO FORM A MOIST POWDER MIXTURE HAVING A WATER CONTENT OF LESS THAN 30% BY WEIGHT, CONTINUING MIXTURE OF THE MIXTURE AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 40*C., UNTIL POLYMERIZATION OF THE FORMALDEHYDE IS SUBSTANTIALLY COMPLETE, AND DRYING THE MIXTURE TO FORM A GRANULAR FORMALDEHYDE POLYMER HAVING A CH2O CONTENT OF AT LEAST 99%.
References Cited (Backward Citations)
US2593862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |