US3581479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Cambridge Filter Corp
•
Filing: 1968-04-08
•
Granted: 1971-06-01
•
Expires: 1988-04-08
Abstract
Abstract Filter having a rectangular frame, the top and bottom frame members having a central groove on their inside face extending to at least one end of the top and bottom members, a filter core within the frame having a length of sheet filter media disposed in pleated formation within the frame, with the respective end edges of the media sealed to the frame end members, and the pleated side edges of the filter embedded in a slab of sealant extending across the inside faces of each of the top and bottom frame members and filling the grooves of said top and bottom members and the method of injecting the sealant in liquid form by means of the groove.
Inventors
- 👤 Roger T Goulet
- 👤 Ernest Zednik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:45
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A filter comprising a rectangular frame, having top, bottom and end members, the top and bottom frame members having a central continuous groove on their inside face extending substantially the entire length to at least one end from adjacent the other end of the respective top and bottom members, a filter core within the frame having a length of sheet filter media disposed in pleated formation within the frame, with the respective end edges of the media sealed to the frame end members, and the pleated side edges of the filter embedded in a slab of sealant extending across the inside faces of each of the top and bottom frame members and filling the grooves of said top and bottom members.
Claim 2
Dependent Claim
121 words
A filter comprising a rectangular frame, having top, bottom and end members, the top and bottom frame members having a central continuous groove on their inside face extending substantially the entire length to at least one end from adjacent the other end of the respective top and bottom members, a filter core within the frame having a length of sheet filter media disposed in pleated formation within the frame, with the respective end edges of the media sealed to the frame end members, and the pleated side edges of the filter embedded in a slab of sealant extending across the inside faces of each of the top and bottom frame members and filling the grooves of said top and bottom members.
Claim 3
Dependent Claim
26 words
A filter according to claim 1 wherein the top and bottom frame members are of facing channel section to provide side flanges to retain the sealant.
Claim 4
Dependent Claim
29 words
A filter according to claim 1 wherein the sealant is a casting compound which has a viscosity low enough to flow into and seal the pack to the frame.
Claim 5
Dependent Claim
36 words
A filter according to claim 1 wherein the frame members are of plywood, and the end members abut the inside faces of the top and bottom members at said end of said top and bottom members.
Claim 6
Dependent Claim
24 words
A filter according to claim 4 wherein the grooves in the top and bottom members at their said ends are provided with a plug.
References Cited (Backward Citations)
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Cited
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |