Patent US3553947A successfully refreshed from Google Patents.
Patent US4215070A successfully refreshed from Google Patents.
US4215070A
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US
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N-(Phosphonoacetyl)-L-aspartic acid compounds and methods for their preparation
Assignee: Starks Associates Inc
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Filing: 1978-10-25
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Granted: 1980-07-29
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Expires: 1998-10-25
Abstract
Abstract N-(Phosphonoacetyl)-L-aspartic acid (PALA) compounds, especially novel PALA compounds, and methods for their preparation in large amounts are disclosed. These methods include preparation of certain PALA compounds such as PALA dibenzyl ester, disodium PALA, and the cyclohexylamine salt of dibenzyl PALA.
Inventors
- 👤 Robert J. Schultz
- 👤 Fred W. Starks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:22
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A compound which is N-(phosphonoacetyl)-L-aspartic acid, disodium salt.
Claim 2
Dependent Claim
8 words
A compound which is N-(phosphonoacetyl)-L-aspartic acid, disodium salt.
References Cited (Backward Citations)
US4154759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |