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US4061627A Expired / Lapsed US ⏱️ 0.0 years remaining

Bis-substituted naphthalene-azo phenyleneazo-stilbene-disulfonic and naphthalene-sulfonic acid

Assignee: Wyeth Holdings LLC
•
Filing: 1975-09-10
•
Granted: 1977-12-06
•
Expires: 1995-09-10
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Abstract

Abstract Bis-substituted naphthylazo - and phenyleneazo - stilbenedisulfonic and naphthalenesulfonic acid salts useful as complement inhibitors.

Inventors

  • 👤 Ransom Brown Conrow
  • 👤 Seymour Bernstein
  • 👤 Norman Bauman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 10:11
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 4 words
4,4'-bis(2-amino-8-hydroxy-6-sulfo-2-naphthylazo)-2,2'-stilbenedisulfonic acid tetrasodium salt.
Claim 2
Dependent Claim 4 words
4,4'-bis(2-amino-8-hydroxy-6-sulfo-2-naphthylazo)-2,2'-stilbenedisulfonic acid tetrasodium salt.
Claim 3
Dependent Claim 4 words
5,5'-[oxybis-(2-amino-p-phenyleneazo)]bis-[6-amino-2-naphthalenesulfonic acid] disodium salt.
Claim 4
Dependent Claim 4 words
5,5'-[oxybis-(2-amino-p-phenyleneazo)]bis-[6-amino-2-naphthalenesulfonic acid] disodium salt.
Claim 5
Dependent Claim 4 words
5,5'-[oxybis-(2-nitro-p-phenyleneazo)]bis-]6-amino-2-naphthalenesulfonic acid] disodium salt.
Claim 6
Dependent Claim 4 words
5,5'-[oxybis-(2-nitro-p-phenyleneazo)]bis-]6-amino-2-naphthalenesulfonic acid] disodium salt.

References Cited (Backward Citations)

FR10259E Cited
DE177178C Cited
US2211752A Cited
GB558219A Cited
US3502644A Cited
US3558592A Cited
DE2150823A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-12-05 1981-06-06 1981-12-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-12-05 1985-06-06 1985-12-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-12-05 1989-06-06 1989-12-06 $7700.00 Window Closed / Lapsed

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