US3093506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight copolymers of unsaturated aldehydes and their preparation and use
Assignee: Shell USA Inc
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Filing: 1960-12-30
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Granted: 1963-06-11
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Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 William T Tsatsos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:54
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08G2/26; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A SOLID WATER-SOLUBLE HIGH MOLECULAR WEIGHT COPOLYMER OF ACROLEIN AND AN ACIDIC MATERIAL OF THE GROUP CONSISTING OF ETHYLENICALLY UNSATURATED CARBOXYLIC ACIDS AND ETHYLENICALLY UNSATURATED POLYCARBOXYLIC ACID ANHYDRIDES, SAID COPOLYMER CONTAINING FROM 55% TO 99% BY WEIGHT OF POLYMERIZED ACROLEIN AND HAVING AN INTRINSIC VISCOSITY ABOVE ABOUT 0.5 DL./G.
Claim 2
Dependent Claim
32 words
A PROCESS FOR TREATING PAPER TO IMPROVE THE WET STRENGTH THEREOF WHICH COMPRISES IMPREGNATING THE PAPER WITH AN AQUEOUS SOLUTION OF A SULFUR DIOXIDE ADDUCT OF THE COPOLYMER DEFINED IN CLAIM 2.
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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |