US4078036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge filter construction
Assignee: Pittsfield Products Inc
•
Filing: 1975-07-24
•
Granted: 1978-03-07
•
Expires: 1995-07-24
Abstract
Abstract In a cartridge filter having a support member defining the shape of the cartridge filter and a filter media contained within the support member, a method of constructing a sealable end cap for the cartridge filter comprising the steps of placing a seal element in the forming cavity of a mold, the cavity adapted to receive one end of the support member therein, and thereafter inserting the end of the support member into the mold cavity. The mold forming cavity is then filled with a molten thermosetting epoxy material so that upon hardening, the epoxy material forms the cartridge filter end cap while simultaneously partially encapsulating the seal element, thus mechanically securing the seal element to the end cap.
Inventors
- 👤 Richard D. Keefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:52
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/84; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B29C70/74; B29C70/76; B29C70/766; B01D2201/00; B01D2201/04; B01D2201/0407; B01D2201/34; B29L; B29L2031/00; B29L2031/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A method for constructing a sealable end cap on a cartridge filter of the type having a support member defining the shape of the cartridge filter and having filter media contained by the support member, said method comprising the steps of: placing an elastomeric seal ring in a first annular groove in a wall defining a mold cavity in a flexible elastomeric mold having an open top, said cavity being adapted to receive a filter support portion, said mold also having a smaller second annular groove in the bottom of said first annular groove communicating with vacuum means; evacuating said second annular groove to retain said seal ring in place in said first groove; inserting said support member portion into said cavity through said open top; filling said mold cavity with molten thermosetting epoxy material so that said epoxy material sealingly engages said support member and encapsulates a portion of the outer periphery of said seal ring extending outside of said first groove; and removing said mold after said epoxy material has hardened.
Claim 2
Independent Claim
173 words
A method for constructing a sealable end cap on a cartridge filter of the type having a support member defining the shape of the cartridge filter and having filter media contained by the support member, said method comprising the steps of: placing an elastomeric seal ring in a first annular groove in a wall defining a mold cavity in a flexible elastomeric mold having an open top, said cavity being adapted to receive a filter support portion, said mold also having a smaller second annular groove in the bottom of said first annular groove communicating with vacuum means; evacuating said second annular groove to retain said seal ring in place in said first groove; inserting said support member portion into said cavity through said open top; filling said mold cavity with molten thermosetting epoxy material so that said epoxy material sealingly engages said support member and encapsulates a portion of the outer periphery of said seal ring extending outside of said first groove; and removing said mold after said epoxy material has hardened.
Claim 3
Dependent Claim
38 words
The invention as defined in claim 1 wherein said mold is constructed of an elastomeric material and said last mentioned step comprises bending the mold away from said epoxy materials and removing said cartridge filter through said opening.
Claim 4
Dependent Claim
21 words
The invention as defined in claim 1 and in which the penultimate step comprises injecting said epoxy into said mold cavity.
Claim 5
Dependent Claim
19 words
The invention as defined in claim 1 wherein said seal ring is constructed of a chemically resistant elastomeric material.
Claim 6
Dependent Claim
14 words
The invention as defined in claim 4 wherein said seal ring is an O-ring.
References Cited (Backward Citations)
US2337550A
Cited
US2732031A
Cited
US2929124A
Cited
US2965933A
Cited
US3271845A
Cited
US3247550A
Cited
US3395208A
Cited
US3362141A
Cited
US3640392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |