US4009239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming tablets with separators of sheet material
Assignee: Individual
•
Filing: 1975-07-11
•
Granted: 1977-02-22
•
Expires: 1995-07-11
Abstract
Abstract Chemical tablets for insertion into settling tanks and the like to dissolve solid waste material are formed in a tablet making press having a female die section which is charged with chemical in powder form. One end of an elongated strip of water soluble paper, having a heat and pressure activated adhesive coating on one surface extends between the female die and the male die carried by the press ram and is advanced in timed relation to the motion of the press. The male die section has a sharpened edge and is heated. As it moves into contact with the female die section it cuts out a separator from the sheet strip and adheres it to the tablet as it is formed. A plurality of such tablets are stacked in a cylindrical container with the separators disposed between adjacent tablets to prevent the tablets from sticking together. In use, the tablet with the separator is thrown into the settling tank and the paper separator is dissolved along with the other solid waste material.
Inventors
- 👤 Max E. Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:02
CPC Classifications
A; A61; A61J; A61J3/00; A61J3/10; B; B30; B30B; B30B11/00; B30B11/02; B30B11/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
178 words
A method of forming a tablet having a separator of sheet material, using a press having a ram, comprising: filling a female die cavity shaped complementary to the ram with a charge of powdered material suitable for tabletting by heat and pressure, covering the charge with a sheet material having a heat sensitive adhesive coating formed on a side adjacent said powdered material so the sheet material is disposed between the female die cavity and the press ram, heating the press ram, moving the ram in the direction of the die cavity so as to contact an uncoated side of the sheet material to first separate a section of said sheet material from a remainder thereof and then moving said ram into the die cavity to press said section under the force of the ram into contact with the powdered material so as to form a tablet conforming to the shape of the female die cavity, and having the section of sheet material covering one side thereof and adhered thereto be said adhesive to act as a separator.
Claim 2
Independent Claim
178 words
A method of forming a tablet having a separator of sheet material, using a press having a ram, comprising: filling a female die cavity shaped complementary to the ram with a charge of powdered material suitable for tabletting by heat and pressure, covering the charge with a sheet material having a heat sensitive adhesive coating formed on a side adjacent said powdered material so the sheet material is disposed between the female die cavity and the press ram, heating the press ram, moving the ram in the direction of the die cavity so as to contact an uncoated side of the sheet material to first separate a section of said sheet material from a remainder thereof and then moving said ram into the die cavity to press said section under the force of the ram into contact with the powdered material so as to form a tablet conforming to the shape of the female die cavity, and having the section of sheet material covering one side thereof and adhered thereto be said adhesive to act as a separator.
Claim 3
Dependent Claim
30 words
The method of claim 1 comprising the further step of stacking a plurality of formed tablets with adhered separators so that the separators prevent the tablets from contacting one another.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the sheet material takes the form of an elongated strip which is advanced relative to the ram between strokes of the ram.
Claim 5
Independent Claim
137 words
The method of forming tablets of chemical material: filling a female die cavity and an aperture in a stripper plate, supported directly above the die cavity, with a charge of said chemical material in an unformed state said chemical material being suitable for tabletting by heat and pressure; advancing a strip of sheet material between the die cavity and the stripper plate; removing said chemical material from the aperture in the stripper plate above the sheet material; then moving a press ram, having a male die section complementary with said female die cavity and having a sharpened edge, through said aperture, against said strip and coacting with the female die so as to substantially simultaneously cut off a portion of said strip, form the charge into a tablet and adhere the cut strip portion to the tablet.
Claim 6
Independent Claim
137 words
The method of forming tablets of chemical material: filling a female die cavity and an aperture in a stripper plate, supported directly above the die cavity, with a charge of said chemical material in an unformed state said chemical material being suitable for tabletting by heat and pressure; advancing a strip of sheet material between the die cavity and the stripper plate; removing said chemical material from the aperture in the stripper plate above the sheet material; then moving a press ram, having a male die section complementary with said female die cavity and having a sharpened edge, through said aperture, against said strip and coacting with the female die so as to substantially simultaneously cut off a portion of said strip, form the charge into a tablet and adhere the cut strip portion to the tablet.
Claim 7
Dependent Claim
51 words
The method of claim 4 wherein the bottom of the female die section is closed by a movable knock-out and the knock-out raises as the male die is removed from said female die section, so as to maintain the completed tablet with its attached cut-out strip section against the male die.
Claim 8
Dependent Claim
29 words
The method of claim 5 wherein the female die section is filled by a nozzle which knocks the completed tablet with its attached strip section onto an output chute.
Claim 9
Dependent Claim
18 words
The method of claim 4 wherein the tablets are liquid soluble and the sheet material is liquid soluble.
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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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |