Patent US4025525A successfully refreshed from Google Patents.
US4025525A
Expired / Lapsed
US
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Allantoin compound with a metal salt of 2-pyrrolidone-5-carboxylic acid
Assignee: Kawaken Fine Chemicals Co Ltd
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Filing: 1975-09-16
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Granted: 1977-05-24
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Expires: 1995-09-16
Abstract
Abstract Allantoin compound with a metal salt of 2-pyrrolidone-5-carboxylic acid has a solubility which is from 2.5 to 4 times greater than that of pure allantoin. The compound has almost the same pharmacological effect as allantoin itself and is harmless, and therefore it can be used in medicines, cosmetics, creams, ointments, etc.
Inventors
- 👤 Hirohide Takayama
- 👤 Ippei Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:36
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/88; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
A compound of the formula ##STR2## in which M is lithium, sodium, potassium, calcium, magnesium, barium or aluminum; n is an integer of one to three; m is zero, one or two; and (m+ is the valence of M.
Claim 2
Dependent Claim
39 words
A compound of the formula ##STR2## in which M is lithium, sodium, potassium, calcium, magnesium, barium or aluminum; n is an integer of one to three; m is zero, one or two; and (m+ is the valence of M.
Claim 3
Dependent Claim
11 words
A compound according to claim 1, in which M is potassium.
Claim 4
Dependent Claim
11 words
A compound according to claim 1, in which M is sodium.
Claim 5
Dependent Claim
11 words
A compound according to claim 1, in which M is calcium.
Claim 6
Dependent Claim
11 words
A compound according to claim 1, in which M is aluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |