Patent US1426348A successfully refreshed from Google Patents.
US1426348A
Expired / Lapsed
US
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Methyl sulphites of secondary aromatic aliphatic amines and process of making same
Assignee: Hoechst AG
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Filing: 1921-07-16
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Granted: 1922-08-22
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Expires: 1941-07-16
Abstract
No abstract record available.
Inventors
- 👤 Bockmuhl Max
- 👤 Windisch Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:17
CPC Classifications
C; C07; C07C; C07C301/00
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) | 1925-08-21 | 1926-02-20 | 1926-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-08-21 | 1930-02-20 | 1930-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-08-21 | 1934-02-20 | 1934-08-22 | $7700.00 | Window Closed / Lapsed |