US3753544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making a liquid filter cartridge
Assignee: Stanadyne LLC
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Filing: 1971-11-19
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Granted: 1973-08-21
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Expires: 1991-11-19
Abstract
Abstract A ported mold having a peripheral lip is positioned in a backing mold having mold pins centrally disposed in the ports and having recesses surrounding the mold pins. The recesses are filled when a layer of flowable plastics material is placed in the ported mold. The lip of a filter housing is positioned in the ported mold and, with the curing of the plastics material, the ported mold becomes a part of the filter and ported abutments forming an inlet and an outlet for the filter are provided. The mold pins may be of different lengths so that the ports may be open, or sealed by a thin layer of plastics material.
Inventors
- 👤 D Hodgkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:37
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D29/05; B01D29/07; B01D29/50; B01D29/52; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
Apparatus for making an enclosed liquid filter cartridge having an accordian pleated filter element in a cup-shaped housing with a folded edge of the filter element exposed at the open end of the housing comprising a ported mold for containing a continuous layer of flowable plastics material into which the lip of the housing and the folded edge of the filter element are embedded during assembly, and a back mold for said ported mold having mold pins centrally disposed within the ports thereof, at least one of said pins providing a central vent fro venting the interior of the filter cartridge during the setting of the flowable plastics material, said back mold further providing recesses surrounding said mold pins to receive and confine the flowable plastics material therein.
Claim 2
Dependent Claim
128 words
Apparatus for making an enclosed liquid filter cartridge having an accordian pleated filter element in a cup-shaped housing with a folded edge of the filter element exposed at the open end of the housing comprising a ported mold for containing a continuous layer of flowable plastics material into which the lip of the housing and the folded edge of the filter element are embedded during assembly, and a back mold for said ported mold having mold pins centrally disposed within the ports thereof, at least one of said pins providing a central vent fro venting the interior of the filter cartridge during the setting of the flowable plastics material, said back mold further providing recesses surrounding said mold pins to receive and confine the flowable plastics material therein.
Claim 3
Dependent Claim
31 words
Apparatus as recited in claim 1 wherein one of said mold pins is longer than the others to extend above the layer of said plastics material and provides a central vent.
Claim 4
Dependent Claim
47 words
Apparatus as recited in claim 2 wherein the shorter mold pin projects above said ported mold an amount greater than the thickness of the continuous layer but by an amount insufficient to cause a discontinuity in the layer of flowable plastics material over said shorter mold pin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |