US3748220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitch stabilization in papermaking
Assignee: Individual
•
Filing: 1972-04-07
•
Granted: 1973-07-24
•
Expires: 1992-04-07
Abstract
Abstract A METHOD OF STABILIZING PITCH IN PAPER PULP BY ADDING TO THE PULP AN AQUEOUS SOLUTION OF NITILOTRIACETIC ACID SODIUM SALT AND A WATER SOLUBLE ACRYLIC POLYMER.
Inventors
- 👤 A Gard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:42
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21C; D21C9/00; D21C9/08; D21C9/086; D21H17/20; D21H17/33; D21H17/34; D21H17/37; Y; Y10; Y10S; Y10S162/00; Y10S162/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |