US2594302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of valuable constituents from waste sulfite liquor
Assignee: St Lawrence Paper Mills Co Ltd
•
Filing: 1949-08-22
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Granted: 1952-04-29
•
Expires: 1969-08-22
Abstract
No abstract record available.
Inventors
- 👤 Ehrensperger Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE RECOVERY OF VALUABLE NITROGEN-CONTAINING CONSTITUENTS FROM LIGNEOUS LIQUORS WHICH COMPRISES TREATING THE LIQUOR WITH A REAGENT SELECTED FROM THE CLASS CONSISTING OF QUATERNARY AMMONIUM BASES AND SALTS AND THEN SEPARATING THE RESULTING PRECIPITATE FROM THE MOTHER LIQUOR.
Claim 2
Dependent Claim
38 words
THE RECOVERY OF VALUABLE NITROGEN-CONTAINING CONSTITUENTS FROM LIGNEOUS LIQUORS WHICH COMPRISES TREATING THE LIQUOR WITH A REAGENT SELECTED FROM THE CLASS CONSISTING OF QUATERNARY AMMONIUM BASES AND SALTS AND THEN SEPARATING THE RESULTING PRECIPITATE FROM THE MOTHER LIQUOR.
References Cited (Backward Citations)
US2379889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |