Patent US2520153A successfully refreshed from Google Patents.
US2520153A
Expired / Lapsed
US
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N-(diarylmethyl)-tertiary-aminoalkanamides and their preparation
Assignee: STWB Inc
•
Filing: 1947-09-11
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Granted: 1950-08-29
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Expires: 1967-09-11
Abstract
No abstract record available.
Inventors
- 👤 Elmer J Lawson
- 👤 George M Fohlen
- 👤 Addelston Aaron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:39
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/14; C07D295/145; C07D295/15; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/84; C07D311/88; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A MEMBER OF THE GROUP CONSISTING OF A BASIC AMIDE HAVING THE FORMULA
Claim 2
Dependent Claim
13 words
A MEMBER OF THE GROUP CONSISTING OF A BASIC AMIDE HAVING THE FORMULA
References Cited (Backward Citations)
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US2356587A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |