US2849314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treatment and products from waste sulfite liquors
Assignee: Permanente Cement Co
•
Filing: 1953-03-02
•
Granted: 1958-08-26
•
Expires: 1973-03-02
Abstract
No abstract record available.
Inventors
- 👤 Worth C Goss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:40
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D21H17/21; D21H17/23; D21J; D21J1/00; D21J1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE PROCESS OF PRODUCING REACTIVE NITROGEN CONTAINING COMPOSITIONS FROM WASTE SULFITE LIQUOR, WHICH ARE CONDENSABLE WITH ALDEHYDES TO FORM POTENTIALLY THERMOSETTING RESINS, COMPRISING HEATING THE LIQUOR IN THE PRESENCE OF AMMONIA TO IMPART A SUBSTANTIAL NITROGEN CONTENT TO THE ACID-PRECIPITATABLE COMPONENT THEREOF, AND ACIDIFYING THE LIQUOR TO PRECIPITATE AND RECOVER SAID NITROGEN-CONTAINING COMPOSITIONS.
Claim 2
Dependent Claim
53 words
THE PROCESS OF PRODUCING REACTIVE NITROGEN CONTAINING COMPOSITIONS FROM WASTE SULFITE LIQUOR, WHICH ARE CONDENSABLE WITH ALDEHYDES TO FORM POTENTIALLY THERMOSETTING RESINS, COMPRISING HEATING THE LIQUOR IN THE PRESENCE OF AMMONIA TO IMPART A SUBSTANTIAL NITROGEN CONTENT TO THE ACID-PRECIPITATABLE COMPONENT THEREOF, AND ACIDIFYING THE LIQUOR TO PRECIPITATE AND RECOVER SAID NITROGEN-CONTAINING COMPOSITIONS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |