US2884407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic modified urea-formaldehyde resins
Assignee: Hercules Powder Co
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Filing: 1954-12-30
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Granted: 1959-04-28
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Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 Gerald I Keim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/50; C; C08; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/34; C08G12/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE METHOD OF PRODUCING A WATER-SOLUBLE CATIONIC THERMOSETTING RESIN ADAPTED FOR APPLICATION TO PAPER TO INCREASE THE WET STRENGTH THEREOF WHICH COMPRISES REACTING UREA FORMALDEHYDE AND AN AQUEOUS SOLUTION OF A TETRAHYDROTRIAZONE COMPOUND SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS OF THE FORMULA
Claim 2
Independent Claim
43 words
THE METHOD OF PRODUCING A WATER-SOLUBLE CATIONIC THERMOSETTING RESIN ADAPTED FOR APPLICATION TO PAPER TO INCREASE THE WET STRENGTH THEREOF WHICH COMPRISES REACTING UREA FORMALDEHYDE AND AN AQUEOUS SOLUTION OF A TETRAHYDROTRIAZONE COMPOUND SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS OF THE FORMULA
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) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |