US3631864A — Cigarette filter

Claim 1

Independent Claim 229 words

In a filter cigarette, a filter assembly in unitary relation with one end of a tobacco rod, said assembly comprising a pair of elongated semicylindrical complemental sections arranged in registered relation so as to form a substantially cylindrical member axially aligned and affixed to the tobacco rod one end, each complemental section being of substantially solid one piece construction and formed of a smoke-impervious material and having a substantially flat inner surface provided with an elongated indentation open at only one end, one section indentation open end facing upstream and terminating adjacent the tobacco rod one end, and the other section indentation open end facing downstream, the closed ends of said section indentations being in overlapping relation; and a thin perforated membrane sandwiched between the flat inner surfaces of said complemental sections and spanning the width of each indentation, the indentations of said sections cooperating with said membrane to form a pair of elongated shallow passageways communicating with one another only through a predetermined number of said membrane perforations, the passageway-communicating perforations being sized whereby smoke passes therethrough in a direction transversely of the axis of said cylindrical member and at a very high velocity and the emitted smoke impinges against a wall of one of the shallow passageways disposed opposite said perforations and effects deposition on said wall of solid and liquid particles entrained in the emitted smoke.

Claim 2

Dependent Claim 229 words

In a filter cigarette, a filter assembly in unitary relation with one end of a tobacco rod, said assembly comprising a pair of elongated semicylindrical complemental sections arranged in registered relation so as to form a substantially cylindrical member axially aligned and affixed to the tobacco rod one end, each complemental section being of substantially solid one piece construction and formed of a smoke-impervious material and having a substantially flat inner surface provided with an elongated indentation open at only one end, one section indentation open end facing upstream and terminating adjacent the tobacco rod one end, and the other section indentation open end facing downstream, the closed ends of said section indentations being in overlapping relation; and a thin perforated membrane sandwiched between the flat inner surfaces of said complemental sections and spanning the width of each indentation, the indentations of said sections cooperating with said membrane to form a pair of elongated shallow passageways communicating with one another only through a predetermined number of said membrane perforations, the passageway-communicating perforations being sized whereby smoke passes therethrough in a direction transversely of the axis of said cylindrical member and at a very high velocity and the emitted smoke impinges against a wall of one of the shallow passageways disposed opposite said perforations and effects deposition on said wall of solid and liquid particles entrained in the emitted smoke.

Claim 3

Dependent Claim 17 words

The filter assembly of claim 1 wherein said complemental sections are formed of a foam plastic material.

Claim 4

Dependent Claim 69 words

The filter assembly of claim 1 wherein the membrane perforations effecting communication between said passageways are circular and have a diameter of from about 0.008 inch to about 0.012 inch, the thickness of said membrane is from about 0.0003 inch to about 0.010 inch, and the distance between said membrane perforations and the impingement wall forming one of said passageways is from about 0.008 inch to about 0.100 inch.

Claim 5

Dependent Claim 33 words

The filter assembly of claim 1 wherein the portion of the indentation against which the high velocity smoke impinges is disposed in closer proximity to the membrane than the remainder of said indentation.

Claim 6

Dependent Claim 144 words

A smoke filter affixed to the downstream end of a tobacco rod or the like, said filter comprising means defining a longitudinally extending first passageway closed at its downstream end and through which the smoke is adapted to flow from said rod, a thin planar perforated membrane lying in a plane parallel to the longitudinal axis of said rod and having a plurality of small perforations through which smoke is adapted to pass in the form of a plurality of high velocity jets upon leaving said first passageway in a direction substantially perpendicular to said axis, and means defining a shallow second passageway closed at its upstream end and separated from said first passageway by said membrane and into which the smoke jets are adapted to flow and impinge against a wall of said second passageway closely adjacent to and opposite said membrane perforations.

Claim 7

Dependent Claim 144 words

A smoke filter affixed to the downstream end of a tobacco rod or the like, said filter comprising means defining a longitudinally extending first passageway closed at its downstream end and through which the smoke is adapted to flow from said rod, a thin planar perforated membrane lying in a plane parallel to the longitudinal axis of said rod and having a plurality of small perforations through which smoke is adapted to pass in the form of a plurality of high velocity jets upon leaving said first passageway in a direction substantially perpendicular to said axis, and means defining a shallow second passageway closed at its upstream end and separated from said first passageway by said membrane and into which the smoke jets are adapted to flow and impinge against a wall of said second passageway closely adjacent to and opposite said membrane perforations.

Claim 8

Dependent Claim 19 words

The filter recited in claim 5 wherein said membrane is sandWiched between said first and second passageway defining means.

Claim 9

Dependent Claim 47 words

The filter recited in claim 5 wherein said first and second passageway defining means comprise complemental smoke barrier sections having opposing parallel planar surfaces between which said membrane is sandwiched, each planar surface having a longitudinally extending indentation defining with said membrane said first and second passageways.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-01-03	1975-07-05	1976-01-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-01-03	1979-07-05	1980-01-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-01-03	1983-07-05	1984-01-04	$7700.00	Window Closed / Lapsed

Cigarette filter

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