US3062703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet-strength paper containing polymeric dialdehydes
Assignee: Individual
•
Filing: 1959-12-10
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Granted: 1962-11-06
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Expires: 1979-12-10
Abstract
No abstract record available.
Inventors
- 👤 Bernard T Hofrciter
- 👤 Hamerstrand George Earle
- 👤 Mehltretter Charles Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:49
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A METHOD OF PRODUCING PAPER HAVING HIGH WETSTRENGTH AND SUBSTANTIALLY IMPROVED DRY-STRENGTH WHICH COMPRISES APPLYING TO THE FIBERS THEREOF ABOUT 0.3 TO 1.0 PERCENT BY WEIGHT OF WATER-DISPERSIBLE, POLYMERICM PARTIALLY DEPOLYMERIZED DIALDEHYDES PREPARED BY HEATING A 70% TO 100% PERIODATE-OXIDIZED STARCH AT ABOUT 92*C. FOR ABOUT FROM 30 TO 90 MINUTES IN WATER CONTAINING ABOUT 0.15 PART OF SODIUM BISULFITE PER PART BY WEIGHT OF SAID PERIODATE-OXIDIZED STARCH SO THAT AT LEAST ABOUT 80% OF SAID POLYMERIC DIALDEHYDES ARE IN THE MOLECULAR WEIGHT RANGE OF 300,000 TO 5 MILLION.
Claim 2
Independent Claim
89 words
A METHOD OF PRODUCING PAPER HAVING HIGH WETSTRENGTH AND SUBSTANTIALLY IMPROVED DRY-STRENGTH WHICH COMPRISES APPLYING TO THE FIBERS THEREOF ABOUT 0.3 TO 1.0 PERCENT BY WEIGHT OF WATER-DISPERSIBLE, POLYMERICM PARTIALLY DEPOLYMERIZED DIALDEHYDES PREPARED BY HEATING A 70% TO 100% PERIODATE-OXIDIZED STARCH AT ABOUT 92*C. FOR ABOUT FROM 30 TO 90 MINUTES IN WATER CONTAINING ABOUT 0.15 PART OF SODIUM BISULFITE PER PART BY WEIGHT OF SAID PERIODATE-OXIDIZED STARCH SO THAT AT LEAST ABOUT 80% OF SAID POLYMERIC DIALDEHYDES ARE IN THE MOLECULAR WEIGHT RANGE OF 300,000 TO 5 MILLION.
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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |