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US3634568A Expired / Lapsed US ⏱️ 0.0 years remaining

Production of coherent bodies from asbestos dispersions

Assignee: WILLIAM K DONALDSON
•
Filing: 1969-04-14
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Granted: 1972-01-11
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Expires: 1989-04-14
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Abstract

Abstract CONTINUOUS STRAND PRODUCTS OF ASBESTOS ARE PRODUCED BY DISPERSING ASBESTOS IN WATER TO PROVIDE A FIBROUS ASBESTOS DISPERSION OF FILM-FORMING CONSTITUTION, THEN CONTACTING THE DISPERSION WITH AN ENDLESS CARRIER WHILE MOVING THE CARRIER IN A GIVEN DIRECTION AND WETTING THE CARRIER WITH COAGULATING LIQUID AHEAD OF THE CONTACTING LOCALITY. A FILM OF ASBESTOS DISPERSION IS THUS ENTRAINED BY THE CARRIER AND COAGULATES AT THE FACE CONTACTING THE CARRIER. THE OTHER FACE OF THE FILM IS SUPPLIED WITH FURTHER COAGULATING LIQUID. WHEN THE FILM IS FULLY COAGULATED IT IS STRIPPED FROM THE CARRIER. PREFERABLY THE FILM IS THEN TWISTED TO YARN DURING ITS CONTINUING TRAVEL. SEVERAL NARROW STRAND COMPONENTS CAN THUS BE PRODUCED BY CONTACT ENTRAINMENT IN PARALLEL RELATION TO EACH OTHER AND ARE THEN TWISTED ABOUT EACH OTHER TO FORM THE YARN.

Inventors

  • 👤 William K Donaldson
  • 👤 Werner Wilke
  • 👤 Hans Fetzer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 10:09
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/16; D02G3/20; C; C04; C04B; C04B30/00; C04B30/02

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-01-10 1975-07-12 1976-01-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-10 1979-07-12 1980-01-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-10 1983-07-12 1984-01-11 $7700.00 Window Closed / Lapsed

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