US2991152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing sodium and potassium hyposulphite
Assignee: GOERRIG
•
Filing: 1958-01-13
•
Granted: 1961-07-04
•
Expires: 1978-01-13
Abstract
No abstract record available.
Inventors
- 👤 Goerrig Dieter
- 👤 Schubert Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:14
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64; C01B17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN A PROCESS FOR THE PRODUCTION OF SODIUM AND POTASSIUM SALTS OF HYPOSULPHUROUS ACID BY THE REDUCTION OF THE SO2-ION IN AQUEOUS SOLUTION, THE STEP WHICH COMPRISES REDUCING THE SO2-ION BY MEANS OF A BOROHYDRIDE WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM BOROHYDRIDE.
Claim 2
Dependent Claim
49 words
IN A PROCESS FOR THE PRODUCTION OF SODIUM AND POTASSIUM SALTS OF HYPOSULPHUROUS ACID BY THE REDUCTION OF THE SO2-ION IN AQUEOUS SOLUTION, THE STEP WHICH COMPRISES REDUCING THE SO2-ION BY MEANS OF A BOROHYDRIDE WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM BOROHYDRIDE.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |