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Patent US3867294A successfully refreshed from Google Patents.
US3867294A
Expired / Lapsed
US
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Cylindrical filter elements with improved side seam seal
Assignee: Pall Corp
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Filing: 1973-05-09
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Granted: 1975-02-18
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Expires: 1993-05-09
Abstract
Abstract Cylindrical filter elements are provided having an improved side seam seal, which can be bonded to end caps in a leak-tight manner.
Inventors
- 👤 David B Pall
- 👤 Tadas K Jasaitis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:24
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A FILTER ELEMENT COMPRISING FILTER SHEET MATERIAL FORMED IN A SUBSTANTIALLY CYLINDRICAL SHAPE, AND HAVING OPPOSITE SHEET END PORTIONS FOLDED OVER WITH OUTER AND INNER END SURFACES IN ADJACENT RELATION AND JOINED TOGETHER IN A SIDE SEAM SEAL, WHEREIN PORTIONS OF THE SHEET ADJACENT THE SHEET ENDS HAVE ONE SURFACE IN FACE-TO-FACE CLOSELY-ABUTTING CONTACT, EXTENDING TO THE END EDGES OF THE SHEET, AND THE NEXT-ADJACENT PORTIONS HAVE THE OTHER SURFACE OPPOSITE EACH OTHER, EXTENDING BEYOND THE END EDGES OF THE END PORTIONS OF THE SHEET, AND SPACED APART BY THE FOLDED-OVER ABUTTING SHEET ENDS, THE OPPOSED SURFACES OF THE SHEET ENDS AND THE END EDGES OF THE SHEET ENDS DEFINING A SPACE THEREBETWEEN, WITH A BONDING AGENT IN THE SPACE BONDING THE SHEETS TOGETHER AT THE END EDGES AND THE OPPOSED SURFACES OF THE SHEET SUBSTANTIALLY WITHOUT PENETRAT-
Claim 2
Dependent Claim
138 words
A FILTER ELEMENT COMPRISING FILTER SHEET MATERIAL FORMED IN A SUBSTANTIALLY CYLINDRICAL SHAPE, AND HAVING OPPOSITE SHEET END PORTIONS FOLDED OVER WITH OUTER AND INNER END SURFACES IN ADJACENT RELATION AND JOINED TOGETHER IN A SIDE SEAM SEAL, WHEREIN PORTIONS OF THE SHEET ADJACENT THE SHEET ENDS HAVE ONE SURFACE IN FACE-TO-FACE CLOSELY-ABUTTING CONTACT, EXTENDING TO THE END EDGES OF THE SHEET, AND THE NEXT-ADJACENT PORTIONS HAVE THE OTHER SURFACE OPPOSITE EACH OTHER, EXTENDING BEYOND THE END EDGES OF THE END PORTIONS OF THE SHEET, AND SPACED APART BY THE FOLDED-OVER ABUTTING SHEET ENDS, THE OPPOSED SURFACES OF THE SHEET ENDS AND THE END EDGES OF THE SHEET ENDS DEFINING A SPACE THEREBETWEEN, WITH A BONDING AGENT IN THE SPACE BONDING THE SHEETS TOGETHER AT THE END EDGES AND THE OPPOSED SURFACES OF THE SHEET SUBSTANTIALLY WITHOUT PENETRAT-
Claim 3
Dependent Claim
16 words
A filter element in accordance with claim 1, wherein the filter sheet material is a paper.
Claim 4
Dependent Claim
16 words
A filter element in accordance with claim 1, wherein the bonding agent is a synthetic resin.
Claim 5
Dependent Claim
27 words
A filter element in accordance with claim 1, having end caps closing off the ends of the cylinder and bonded to the ends in a leak-tight seal.
Claim 6
Dependent Claim
33 words
A filter element in accordance with claim 4, wherein the end caps are bonded to the ends of the cylinder by a synthetic resin which impregnates the filter sheet material at such ends.
Claim 7
Dependent Claim
19 words
A filter element in accordance with claim 1, in which the sheet material is folded in a corrugated configuration.
Claim 8
Dependent Claim
36 words
A filter element in accordance with claim 6, in which the sheet end portions in face-to-face relationship in the side seam seal each comprise the first and second corrugations of the sheet material from the ends.
Claim 9
Dependent Claim
15 words
A filter element in accordance with claim 7, in which the sheet material comprises paper.
Claim 10
Dependent Claim
27 words
A filter element in accordance with claim 1, having end caps closing off the ends of the cylinder and melt-bonded to the ends in a leak-tight seal.
Claim 11
Dependent Claim
25 words
A filter element in accordance with claim 1, having the filter sheet material sandwiched between protective porous sheets of higher porosity than the filter sheet.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |