US2652375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of articles of improved water resistance from urea-formaldehyde resins
Assignee: Libbey Owens Ford Glass Co
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Filing: 1951-03-08
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Granted: 1953-09-15
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Expires: 1971-03-08
Abstract
No abstract record available.
Inventors
- 👤 David E Cordier
- 👤 William D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:04
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD OF PRODUCING A MATERIAL THAT CAN BE HOT PRESSED TO PRODUCE ARTICLES OF GREATLY IMPROVED WATER RESISTANCE, WHICH COMPRISES IMPREGNATING CELLULOSE WITH A THERMOSETTING REACTION PRODUCT OF FORMALDEHYDE AND A SUBSTANCE WHOSE MOLECULE HAS A PLURALITY OF NH2 GROUPS EACH CONNECTED TO A CARBON ATOM CONTAINED IN A HETEROCYCLIC RING, THE RING CONSISTING OF FROM FIVE TO SIX CARBON AND NITROGEN ATOMS OF WHICH NOT MORE THAN THREE ARE NITROGEN ATOMS, THE CARBON ATOM BEING CONNECTED BY A DOUBLE BOND TO AN INTRACYCLIC NITROGEN ATOM, CONVERTING THE REACTION PRODUCT TO ITS INFUSIBLE STATE, THE AMOUNT OF THE REACTION PRODUCT BEING SUCH THAT 2.5 TO 40 PER CENT OF THE TREATED CELLULOSE CONSISTS OF THE INFUSIBLE REACTION PRODUCT, AND THEN THOROUGHLY IMPREGNATING THE CELLULOSE WITH AN AQUEOUS SOLUTION OF A THERMOSETTING UREA-FORMALDEHYDE REACTION PRODUCT, AND DRYING.
Claim 2
Independent Claim
137 words
A METHOD OF PRODUCING A MATERIAL THAT CAN BE HOT PRESSED TO PRODUCE ARTICLES OF GREATLY IMPROVED WATER RESISTANCE, WHICH COMPRISES IMPREGNATING CELLULOSE WITH A THERMOSETTING REACTION PRODUCT OF FORMALDEHYDE AND A SUBSTANCE WHOSE MOLECULE HAS A PLURALITY OF NH2 GROUPS EACH CONNECTED TO A CARBON ATOM CONTAINED IN A HETEROCYCLIC RING, THE RING CONSISTING OF FROM FIVE TO SIX CARBON AND NITROGEN ATOMS OF WHICH NOT MORE THAN THREE ARE NITROGEN ATOMS, THE CARBON ATOM BEING CONNECTED BY A DOUBLE BOND TO AN INTRACYCLIC NITROGEN ATOM, CONVERTING THE REACTION PRODUCT TO ITS INFUSIBLE STATE, THE AMOUNT OF THE REACTION PRODUCT BEING SUCH THAT 2.5 TO 40 PER CENT OF THE TREATED CELLULOSE CONSISTS OF THE INFUSIBLE REACTION PRODUCT, AND THEN THOROUGHLY IMPREGNATING THE CELLULOSE WITH AN AQUEOUS SOLUTION OF A THERMOSETTING UREA-FORMALDEHYDE REACTION PRODUCT, AND DRYING.
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) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |