Patent US2502453A successfully refreshed from Google Patents.
US2502453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of beta-(nu, nu-diphenyl)-amino propionic acid
Assignee: Goodrich Corp
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Filing: 1947-01-02
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Granted: 1950-04-04
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Expires: 1967-01-02
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Gresham
- 👤 Ralph A Bankert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:29
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/63; C07D213/68; C07C; C07C229/00; C07C229/02; C07C229/04; C07C229/06; C07C229/08; C07B; C07B2200/00; C07B2200/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
THE METHOD WHICH COMPRISES REACTING DIPHENYLAMINE WITH BETA-PROPIOLACTONE AND RECOVERING PRIMARILY BETA-(N,N-DIPHENYL)-AMINO PROPIONIC ACID.
Claim 2
Independent Claim
14 words
THE METHOD WHICH COMPRISES REACTING DIPHENYLAMINE WITH BETA-PROPIOLACTONE AND RECOVERING PRIMARILY BETA-(N,N-DIPHENYL)-AMINO PROPIONIC ACID.
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) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |