US3720323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth-type filter for operation with high differential pressures across the filter
Assignee: Bendix Corp
•
Filing: 1969-11-10
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Granted: 1973-03-13
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Expires: 1989-11-10
Abstract
Abstract A filter assembly having a pleated depth-type filter element bonded at each end portion to metallic end caps by a thermosetting bonding agent being improved by having a flexible reinforcing strip bonded to the downstream side of the end portions of the pleated filter media continuously along the pleats thereof such that the reinforcing strip and the area of bonding to the filter media extends substantially above the bonding agent. The reinforcing strip has a substantially greater shear strength than the filter material and a porosity not greater than the filter material.
Inventors
- 👤 R Landree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D2201/00; B01D2201/18; B01D2201/182
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
181 words
A filter assembly for operation with high differential pressures across said filter assembly comprising: a pleated filter element of porous depth-type filtering material formed in a generally tubular form with its pleats extending axially thereof; an end cap having a recess of predetermined depth accepting said pleated filter element at an end portion thereof; a flexible reinforcing strip having a porosity not greater than said filtering material and a shear strength substantially greater than said filtering material bonded to said pleated filter element continuously along said pleats at said one end portion; and a bonding agent in said recess at a predetermined level for bonding said pleated filter element end portion to said end cap; said reinforcing strip extending into said bonding agent and having a predetermined width such that it extends substantially above said bonding agent level so as to flexibly support the filter material during filtering action for a substantial distance above the bonding agent level to prevent loss of filtering capability due to shear fractures of said filtering material in the immediate vicinity of said bonding agent level.
Claim 2
Dependent Claim
181 words
A filter assembly for operation with high differential pressures across said filter assembly comprising: a pleated filter element of porous depth-type filtering material formed in a generally tubular form with its pleats extending axially thereof; an end cap having a recess of predetermined depth accepting said pleated filter element at an end portion thereof; a flexible reinforcing strip having a porosity not greater than said filtering material and a shear strength substantially greater than said filtering material bonded to said pleated filter element continuously along said pleats at said one end portion; and a bonding agent in said recess at a predetermined level for bonding said pleated filter element end portion to said end cap; said reinforcing strip extending into said bonding agent and having a predetermined width such that it extends substantially above said bonding agent level so as to flexibly support the filter material during filtering action for a substantial distance above the bonding agent level to prevent loss of filtering capability due to shear fractures of said filtering material in the immediate vicinity of said bonding agent level.
Claim 3
Dependent Claim
15 words
The filter assembly of claim 1 wherein said end cap consists of a metallic material.
Claim 4
Dependent Claim
14 words
The filter assembly of claim 1 wherein said bonding agent is a thermosetting agent.
Claim 5
Dependent Claim
14 words
The filter assembly of claim 1 wherein said bonding agent is an epoxy resin.
Claim 6
Dependent Claim
14 words
The filter assembly of claim 1 wherein said reinforcing strip is a metallic mesh.
Claim 7
Dependent Claim
12 words
The filter assembly of claim 1 wherein said reinforcing strip is nonporous.
Claim 8
Dependent Claim
14 words
The filter assembly of claim 6 wherein said reinforcing strip is a metal strip.
Claim 9
Dependent Claim
169 words
The filter assembly of claim 1 further including: a second end cap having a recess of predetermined depth for accepting said pleated filter element at the end portion thereof which is opposite said first-mentioned end portion; a second flexible reinforcing strip having a porosity not greater than said filtering material and a shear strength substantially greater than said filtering material bonded to said pleated filter element continuously along the pleats thereof at said opposite end portion; and a bonding agent in said recess of said second end cap for bonding said pleated filter element other end portion to said second end cap; said second reinforcing strip extending into said bonding agent and having a predetermined width such that it extends substantially above said bonding agent level so as to flexibly support the filter material during filtering action for a substantial distance above the bonding agent level to prevent loss of filtering capability due to shear fractures of said filtering material in the immediate vicinity of said bonding agent level.
Claim 10
Dependent Claim
15 words
The filter assembly of claim 8 wherein said second cap consists of a metallic material.
Claim 11
Dependent Claim
20 words
The filter assembly of claim 8 wherein said bonding agent for each of said end caps is a thermosetting agent.
Claim 12
Dependent Claim
20 words
The filter assembly of claim 8 wherein said bonding agent for each of said end caps is an epoxy resin.
Claim 13
Dependent Claim
16 words
The filter assembly of claim 8 wherein said reinforcing strips are constructed of metallic mesh material.
Claim 14
Dependent Claim
12 words
The filter assembly of claim 8 wherein said reinforcing strips are nonporous.
References Cited (Backward Citations)
US3013667A
Cited
US3038211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |