Patent US1518043A successfully refreshed from Google Patents.
US1518043A
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Process for the preparation of sulphuric anhydride by contact by means of vanadium salts
Assignee: Kuhlmann SA
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Filing: 1923-11-19
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Granted: 1924-12-02
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Expires: 1943-11-19
Abstract
No abstract record available.
Inventors
- 👤 Audianne Paul
- 👤 Bachalard Gabriel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:00
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/78; C01B17/79; B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0453; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00176; B01J2208/00212; B01J2208/00796; B01J2208/00823; B01J2208/00831; B01J2208/00849
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) | 1927-12-02 | 1928-06-02 | 1928-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-12-02 | 1932-06-02 | 1932-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-12-02 | 1936-06-02 | 1936-12-02 | $7700.00 | Window Closed / Lapsed |