Patent US2193944A successfully refreshed from Google Patents.
US2193944A
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US
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Alkylation products of aromatic compounds and a process of preparing them
Assignee: IG Farbenindustrie AG
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Filing: 1938-02-01
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Granted: 1940-03-19
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Expires: 1958-02-01
Abstract
No abstract record available.
Inventors
- 👤 Steindorff Adolf
- 👤 Platz Carl
- 👤 Rosenbach Johann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:24
CPC Classifications
C; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/07; C07C309/09; C07C309/10; C07C309/13; C07C309/14; C07C309/15; C07C309/28; C07C309/41; C07C309/42; C07C309/45; C07C309/51
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) | 1943-03-19 | 1943-09-18 | 1944-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-19 | 1947-09-18 | 1948-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-19 | 1951-09-18 | 1952-03-19 | $7700.00 | Window Closed / Lapsed |