US3087852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic polymeric dialdehydes and their use in making wet strength paper
Assignee: Individual
•
Filing: 1961-03-29
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Granted: 1963-04-30
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Expires: 1981-03-29
Abstract
No abstract record available.
Inventors
- 👤 Bernard T Hofreiter
- 👤 Hamerstrand George Earle
- 👤 Charles L Mehltretter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:09
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29; C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B31/125; C08B31/18; C08B31/185
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
POLYMERIC NITROGENOUS DIALDEHYDES HAVING SUBSTITUTED MONOMERIC UNITS THAT CONFORM TO THE FORMULA
Claim 2
Dependent Claim
12 words
POLYMERIC NITROGENOUS DIALDEHYDES HAVING SUBSTITUTED MONOMERIC UNITS THAT CONFORM TO THE FORMULA
Claim 3
Dependent Claim
57 words
COMPOSITIONS OF MATTER ESPECIALLY SUITABLE FOR THE MANUFACTURE OF PAPER AND FILTED CELLULOSIC MATERIALS THAT ARE CHARACTERIZED BY HAVING HIGH WET STRENGTH, SAID COMPOSITIONS COMPRISING AN AQUEOUS DISPERSION OF CELLULOSIC FIBERS ADSORBED THEREON, FROM 0.5 PERCENT TO 5 PERCENT BASED ON THE DRY WEIGHT OF THE FIBERS OF A POLYMERIC NITROGENOUS DIALDEHYDE AS DEFINED IN CLAIM 1.
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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |