US2680682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper of improved wet strength
Assignee: Honeywell International Inc
•
Filing: 1950-01-26
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Granted: 1954-06-08
•
Expires: 1970-01-26
Abstract
No abstract record available.
Inventors
- 👤 William C Dearing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:38
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
PAPER OF IMPROVED WET STRENGTH CONTAINING 0.1-10 PER CENT OF ITS DRY PULP WEIGHT OF CONDENSATION PRODUCT OF (A) FORMALDEHYDE (B) A SUBSTANCE OF THE CLASS CONSISTING OF UREA AND MELAMINE AND (C) 0.05-0.25 MOL PER MOL OF (B) OF A CARBOXYLIC ACID DERIVATIVE OF THE CLASS CONSISTING OF SUBSTITUTED ALIPHATIC CARBOXYLIC ACIDS AND ALKALI METAL SALTS THEREOF, WHOSE MOLECULE HAS NOT MORE THAN EIGHT CARBON ATOMS AND HAS FROM TWO TO FOUR CARBON ATOMS PER CARBOXY GROUP; SAID CONDENSATION PRODUCT CONTAINING NO MONOVALENT SUBSTITUTENTS DERIVED FROM (A), (B) AND (C) OTHER THAN -NH2, -OH, -COOH AND COOM GROUPS, WHEREIN M IS AN ALKALI METAL, THE MOLAR RATIO OF (A) TO (B) BEING FROM 1.8:1 TO 2.2:1 WHEN (B) IS UREA AND THE MOLAR RATIO OF (A) TO (B) BEING FROM 4:1 TO 7:1 WHEN (B) IS MELAMINE.
Claim 2
Dependent Claim
138 words
PAPER OF IMPROVED WET STRENGTH CONTAINING 0.1-10 PER CENT OF ITS DRY PULP WEIGHT OF CONDENSATION PRODUCT OF (A) FORMALDEHYDE (B) A SUBSTANCE OF THE CLASS CONSISTING OF UREA AND MELAMINE AND (C) 0.05-0.25 MOL PER MOL OF (B) OF A CARBOXYLIC ACID DERIVATIVE OF THE CLASS CONSISTING OF SUBSTITUTED ALIPHATIC CARBOXYLIC ACIDS AND ALKALI METAL SALTS THEREOF, WHOSE MOLECULE HAS NOT MORE THAN EIGHT CARBON ATOMS AND HAS FROM TWO TO FOUR CARBON ATOMS PER CARBOXY GROUP; SAID CONDENSATION PRODUCT CONTAINING NO MONOVALENT SUBSTITUTENTS DERIVED FROM (A), (B) AND (C) OTHER THAN -NH2, -OH, -COOH AND COOM GROUPS, WHEREIN M IS AN ALKALI METAL, THE MOLAR RATIO OF (A) TO (B) BEING FROM 1.8:1 TO 2.2:1 WHEN (B) IS UREA AND THE MOLAR RATIO OF (A) TO (B) BEING FROM 4:1 TO 7:1 WHEN (B) IS MELAMINE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |