§
PatentCue
Patent Intelligence
Join Waitlist Sign In
Patent US4191840A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4191840A Expired / Lapsed US ⏱️ 0.0 years remaining

Oxamic acid derivatives

Assignee: Wyeth LLC
•
Filing: 1979-02-07
•
Granted: 1980-03-04
•
Expires: 1999-02-07
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Anti-allergic agents of aromatic oxamic acid derivation present the following formula: ##STR1## in which A is a member selected from the group consisting of α-naphthyl, β-napthtyl, phenyl, 2,6-di-chlorophenyl, and substituted phenyl moieties containing from one to three substituents in any of the 2,3,4 and 5 positions of the phenyl ring, independently selected from the group consisting of lower alkyl, lower alkylthio, lower alkylsulfinyl, lower alkoxy, hydroxy (lower)alkoxy, 2-(oxalyloxy) ethoxy, benzyloxy, N-mono- and di-lower alkylamino(lower)alkoxy, halo, sulfamyl, polyhalo(lower)alkyl, carbamyl, N-lower alkylcarbamyl, nitro, mono and di lower alkylamino, carboxy, lower alkylcarbonyl, carb(lower)alkoxy, phenoxy(lower)alkoxy, and oxalamidophenoxy radicals; and pharmaceutically acceptable salts thereof.

Inventors

  • 👤 John H. Sellstedt
  • 👤 Charles J. Guinosso
  • 👤 Albert J. Begany

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 08:03
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/75; C07C; C07C245/00; C07C245/02; C07C245/06; C07C245/08; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07D257/00; C07D257/02; C07D257/04; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/38; C07D277/44; C07D277/46

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 51 words
A compound of the formula: ##STR6## wherein R 1 is amino or lower(alkyl)amino; R 2 in N-mono- or di-lower alkylamino(lower)alkoxy or mono- or di-lower alkylamino; R 3 is hydrogen, lower alkyl, lower alkoxy, halo or nitro; R 4 is hydrogen, lower alkyl or lower alkoxy; or a pharmaceutically acceptable salt thereof.
Claim 2
Dependent Claim 51 words
A compound of the formula: ##STR6## wherein R 1 is amino or lower(alkyl)amino; R 2 in N-mono- or di-lower alkylamino(lower)alkoxy or mono- or di-lower alkylamino; R 3 is hydrogen, lower alkyl, lower alkoxy, halo or nitro; R 4 is hydrogen, lower alkyl or lower alkoxy; or a pharmaceutically acceptable salt thereof.
Claim 3
Dependent Claim 13 words
A compound of claim 1 in which R 1 is --NH 2 .
Claim 4
Dependent Claim 12 words
A compound of claim 2 in which R 2 is lower alkylamino.
Claim 5
Dependent Claim 11 words
A compound of claim 2 in which R 2 is di(lower)alkylamino.
Claim 6
Dependent Claim 15 words
A compound of claim 2 which is 2'-carbamyl-3'-(2-dimethylaminoethoxy)oxanilic acid or a pharmaceutically acceptable salt thereof.
Claim 7
Dependent Claim 15 words
A compound of claim 4 which is 2'-carbamyl-3'-dimethylamino-oxanilic acid or a pharmaceutically acceptable salt thereof.
Claim 8
Dependent Claim 15 words
A compound of claim 3 which is 2'-carbamyl-3'-methylamino-oxanilic acid or a pharmaceutically acceptable salt thereof.

References Cited (Backward Citations)

US2274716A Cited
US3683020A Cited
US3906033A Cited
US3993679A Cited
US4017538A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-03-04 1983-09-03 1984-03-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-03-04 1987-09-03 1988-03-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-03-04 1991-09-03 1992-03-04 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag