US3582461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitch control in pulp and papermaking processes
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1968-02-14
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Granted: 1971-06-01
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Expires: 1988-02-14
Abstract
Abstract WATER SOLUBLE DICYANDIAMIDE-FORMALDEHYDE CONDENSATES ARE USED IN CONTROLLING THE PITCH WHICH FORMS DURING PULP AND PAPERMAKING PROCESSES. A CONDENSATE WHICH IS THE REACTION PRODUCT OF DICYANDIAMIDE AND FORMALDEHYDE IS EFFECTIVE IN CONTROLLING THE PITCH WHICH IS LIBERATED DURING PULP AND PAPERMAKING PROCESSES.
Inventors
- 👤 Stanley A Lipowski
- 👤 James F Hern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:29
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/08; D21C9/086; D21H; D21H21/00; D21H21/02; Y; Y10; Y10S; Y10S162/00; Y10S162/04; Y10S516/00; Y10S516/01; Y10S516/07
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |