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US3649163A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for removing noncollagenous matter from mammalian gut

Assignee: Wyeth Holdings LLC
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Filing: 1968-03-25
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Granted: 1972-03-14
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Expires: 1988-03-25
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Abstract

Abstract Gut strands used to manufacture sutures, tennis racquet stringing and such are treated at least once with an aqueous nonionic surfactant solution consisting essentially of from about 0.2 to about 5 percent surfactant to remove a portion of the noncollagenous matter therefrom. Subsequent treatment of the gut with aqueous alkaline solutions removes the remaining portion of the noncollagenous matter to produce a collagen strand substantially free from noncollagenous matter (i.e., fats and noncollagenous protein). Strands so treated are of light color and high strength. Such strands may be uniformly tanned. The strands resist undesirable color intensification at elevated temperatures and do not discolor suture tubing fluids.

Inventors

  • 👤 Edward Joseph Mccusker

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 00:41
CPC Classifications
A; A61; A61L; A61L17/00; A61L17/06; A61L17/08; D; D01; D01C; D01C3/00

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

FR389719A Cited
DE428292C Cited
US2280603A Cited
US2750251A Cited
US3071477A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-03-14 1975-09-13 1976-03-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-03-14 1979-09-13 1980-03-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-03-14 1983-09-13 1984-03-14 $7700.00 Window Closed / Lapsed

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