Patent US2729617A successfully refreshed from Google Patents.
US2729617A
Expired / Lapsed
US
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Production of thermosetting synthetic resins capable of imparting improved wet strength to paper
Assignee: Honeywell International Inc
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Filing: 1952-04-14
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Granted: 1956-01-03
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Expires: 1972-04-14
Abstract
No abstract record available.
Inventors
- 👤 John B Davidson
- 👤 Edward J Romatowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:47
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PRODUCING A THERMOSETTLING SYNTHETIC RESIN CAPABLE OF IMPARTING IMPROVED WET STRENGTH TO PAPER, THAT COMPRISES REACTING 1 MOL OF AMMONIA WITH 1 TO 4 MOLS OF FORMALDEHYDE AND 1 TO 6 MOLS OF FORMIC ACID IN AQUEOUS SOLUTION TO PRODUCE METHYLAMINES, AND REACTING FROM 3 1/3 TO 100 MOL OF UREA PER MOL OF AMMONIA AND 1.8 TO 2.4 MOLS OF FORMALDEHYDE PER MOL OF UREA IN AQUEOUS SOLUTION WITH THE METHYL AMINES SO PRODUCED AT A PH BETWEEN ABOUT 3.0 AND ABOUT 6.5.
Claim 2
Independent Claim
87 words
A METHOD OF PRODUCING A THERMOSETTLING SYNTHETIC RESIN CAPABLE OF IMPARTING IMPROVED WET STRENGTH TO PAPER, THAT COMPRISES REACTING 1 MOL OF AMMONIA WITH 1 TO 4 MOLS OF FORMALDEHYDE AND 1 TO 6 MOLS OF FORMIC ACID IN AQUEOUS SOLUTION TO PRODUCE METHYLAMINES, AND REACTING FROM 3 1/3 TO 100 MOL OF UREA PER MOL OF AMMONIA AND 1.8 TO 2.4 MOLS OF FORMALDEHYDE PER MOL OF UREA IN AQUEOUS SOLUTION WITH THE METHYL AMINES SO PRODUCED AT A PH BETWEEN ABOUT 3.0 AND ABOUT 6.5.
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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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |