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US3638918A Expired / Lapsed US ⏱️ 0.0 years remaining

Mixing of substances

Assignee: Dental Design Systems Inc
•
Filing: 1970-03-09
•
Granted: 1972-02-01
•
Expires: 1990-03-09
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Abstract

Abstract Method and apparatus for the intermixing of substances using a capsule formed by a receptacle with an internal sack and a movable, desirably hollow plunger that acts tangentially against the sack. The receptacle, illustratively of plastic, contains a first substance, such as a powder, and the sack, which is metallized to prevent loss of its contents, contains a second substance, such as a liquid. Illustratively, the liquid is monomer and the powder is a resin constituent. When the two substances are mixed, they produce a composite resin which may be used, for example, for dental fillings. When the plunger, also of plastic, is depressed into the receptacle, it engages and squeezes the sack, expelling its contents into the receptacle, and thereafter sandwiches the sack between the plunger and a sidewall of the receptacle.

Inventors

  • 👤 Melvin Denholtz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 14:48
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/60; A61C5/66; Y; Y10; Y10S; Y10S366/00; Y10S366/602

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 57 words
A mixing capsule as defined in claim 1 wherein said plunger is cylindrical with a contoured tip end and is circumferentially spaced from the interior sidewall of said receptacle and said sealed enclosure is a sack with the major portion thereof positioned within the space between said interior sidewall and the path of movement of said plunger.
Claim 2
Dependent Claim 12 words
expelling the contents of said enclosure into said receptacle by said plunger;
Claim 3
Dependent Claim 10 words
trapping said enclosure between said receptacle and said plunger; and
Claim 4
Dependent Claim 17 words
A mixing capsule as defined in claim 2 wherein said sack is affixed to said interior sidewall.
Claim 5
Dependent Claim 21 words
A mixing capsule as defined in claim 2 wherein the tip end of said plunger includes means for penetrating said enclosure.
Claim 6
Dependent Claim 12 words
agitating said capsule to mix said first substance with said second substance.
Claim 7
Dependent Claim 23 words
A mixing capsule as defined in claim 4 wherein the penetrating means on the tip end of said plunger comprises a cutting blade.
Claim 8
Dependent Claim 13 words
A mixing capsule as defined in claim 2 wherein said sack is elongated.
Claim 9
Dependent Claim 17 words
A mixing capsule as defined in claim 6 wherein the elongated sack is suspended in said receptacle.
Claim 10
Dependent Claim 37 words
A mixing capsule as defined in claim 2 wherein said plunger has an axial groove in the outer surface thereof and said enclosure comprises a sack with a stem that lies in said groove of said plunger.
Claim 11
Dependent Claim 29 words
A mixing capsule as defined in claim 2 wherein said sack is of metal foil with a plastic coating on interior and exterior surfaces to facilitate the sealing thereof.
Claim 12
Independent Claim 9 words
The method of mixing substances comprising the steps of:

References Cited (Backward Citations)

US2527992A Cited
US2653611A Cited
US2721552A Cited
US3156369A Cited
US3266671A Cited
US3344914A Cited
US3537577A Cited
US3454177A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-01-31 1975-08-02 1976-02-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-31 1979-08-02 1980-02-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-31 1983-08-02 1984-02-01 $7700.00 Window Closed / Lapsed

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