US2723253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermo-settable intermediate condensation products
Assignee: SIDNEY HAAS
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Filing: 1952-10-25
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Granted: 1955-11-08
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Expires: 1972-10-25
Abstract
No abstract record available.
Inventors
- 👤 James W Wandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:45
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A METHOD OF MANUFACTURING A THERMO-SETTABLE FORMALDEHYDE-URA INTERMEDIATE CONDENSATION PRODUCT, THAT IMPROVEMENT INCLUDING THE STEPS OF ADDING UREA TO AN AQUEOUS SYRUPY INITIAL FORMALDEHYDE-UREA CONDENSATION MASS HAVING A FILLER INCORPORATED THEREIN, THE MOLECULAR RATIO OF THE FORMALDEHYDE TO THE UREA IN THE INITIAL CONDENSATION MASS RANGING FROM 2 1/2 TO 1 3/4 MOLES OF FORMALDEHYDE TO 1 MOLE OF UREA, THE AMOUNT OF UREA ADDED BEING SUFFICIENT TO CHANGE THE FORMALDEHYDE TO UREA MOLECULAR RATIO TO FROM 1 1/2 TO 1 1/4 MOLES OF FORMALDEHYDE TO 1 MOLE OF UREA, AND HEATING THE RESULTANT MIXTURE FOR A SHORT PERIOD OF TIME AT A TEMPERATURE BETWEEN 270* TO 300*F. TO QUICKLY DRY THE MIXTURE WHILE SIMULTANEOUSLY REACTING THE INITIAL CONDENSATION MASS WITH THE UREA TO FORM THE INTERMEDIATE CONDENSATION PRODUCT.
Claim 2
Dependent Claim
130 words
IN A METHOD OF MANUFACTURING A THERMO-SETTABLE FORMALDEHYDE-URA INTERMEDIATE CONDENSATION PRODUCT, THAT IMPROVEMENT INCLUDING THE STEPS OF ADDING UREA TO AN AQUEOUS SYRUPY INITIAL FORMALDEHYDE-UREA CONDENSATION MASS HAVING A FILLER INCORPORATED THEREIN, THE MOLECULAR RATIO OF THE FORMALDEHYDE TO THE UREA IN THE INITIAL CONDENSATION MASS RANGING FROM 2 1/2 TO 1 3/4 MOLES OF FORMALDEHYDE TO 1 MOLE OF UREA, THE AMOUNT OF UREA ADDED BEING SUFFICIENT TO CHANGE THE FORMALDEHYDE TO UREA MOLECULAR RATIO TO FROM 1 1/2 TO 1 1/4 MOLES OF FORMALDEHYDE TO 1 MOLE OF UREA, AND HEATING THE RESULTANT MIXTURE FOR A SHORT PERIOD OF TIME AT A TEMPERATURE BETWEEN 270* TO 300*F. TO QUICKLY DRY THE MIXTURE WHILE SIMULTANEOUSLY REACTING THE INITIAL CONDENSATION MASS WITH THE UREA TO FORM THE INTERMEDIATE CONDENSATION PRODUCT.
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) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |