US4402830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated filter element with external spiral tape support
Assignee: Pall Corp
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Filing: 1982-01-13
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Granted: 1983-09-06
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Expires: 2002-01-13
Abstract
Abstract A corrugated cylindrical filter element is provided having an external spiral tape support, comprising a corrugated filter sheet material in the form of a cylinder having an end cap at each end of the cylinder sealingly bonded to the filter sheet material at that end, the corrugations of the filter sheet material having a tendency to become distorted and displaced with respect to each other under the conditions to which the material is subjected in use, and a relatively narrow strip to continuous high-modulus fiber-reinforced synthetic plastic tape spirally wound around the cylinder, spanning the corrugations and extending between each end and bonded to the end cap and to the tips of the corrugations in a manner to prevent distortion and displacement thereof.
Inventors
- 👤 David B. Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:23
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D2201/00; B01D2201/04; B01D2201/0407
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
A corrugated cylindrical filter element comprising a corrugated filter sheet material in the form of a cylinder and having an end cap at each end of the cylinder sealingly bonded to the filter sheet material at that end, the corrugations of the filter sheet material having a tendency to become distorted and displaced with respect to each other under the conditions to which the material is subjected in use; and a relatively narrow strip of continuous high modulus fiber-reinforced tape of synthetic plastic material spirally wound around the cylinder, spanning the corrugations and extending between each end and bonded to the end cap and to the tips of the corrugations in a manner to prevent distortion and displacement thereof.
Claim 2
Dependent Claim
119 words
A corrugated cylindrical filter element comprising a corrugated filter sheet material in the form of a cylinder and having an end cap at each end of the cylinder sealingly bonded to the filter sheet material at that end, the corrugations of the filter sheet material having a tendency to become distorted and displaced with respect to each other under the conditions to which the material is subjected in use; and a relatively narrow strip of continuous high modulus fiber-reinforced tape of synthetic plastic material spirally wound around the cylinder, spanning the corrugations and extending between each end and bonded to the end cap and to the tips of the corrugations in a manner to prevent distortion and displacement thereof.
Claim 3
Dependent Claim
17 words
A filter element in accordance with claim 1, in which the tape is made of thermoplastic material.
Claim 4
Dependent Claim
16 words
A filter element in accordance with claim 1, in which the tape is made of polypropylene.
Claim 5
Dependent Claim
18 words
A filter element in accordance with claim 1, in which the end caps are made of thermoplastic material.
Claim 6
Dependent Claim
22 words
A filter element in accordance with claim 1, having within the cylinder of filter material a core made of a thermoplastic material.
Claim 7
Dependent Claim
19 words
A filter element in accordance with claim 5, in which the end caps and core are made of polypropylene.
Claim 8
Dependent Claim
18 words
A filter element in accordance with claim 1, in which the corrugated filter sheet is made of paper.
Claim 9
Dependent Claim
29 words
A filter element in accordance with claim 1, in which the filter sheet is made from a material that comprises a porous base having a microporous layer adhered thereto.
Claim 10
Dependent Claim
15 words
A filter element in accordance with claim 1, in which the fibers are glass filaments.
Claim 11
Dependent Claim
25 words
A filter element in accordance with claim 9, in which the glass filaments are in the form of a warp extending longitudinally of the tape.
Claim 12
Dependent Claim
30 words
A filter element in accordance with claim 1, in which the tape is from about 0.1 to about 0.4 mm thick and from about 3 to about 8 mm wide.
Claim 13
Dependent Claim
18 words
A filter element in accordance with claim 1, in which the tape is a pressure sensitive adhesive tape.
Claim 14
Dependent Claim
31 words
A filter element in accordance with claim 1, in which the tape spirals terminate in a circumferential wrap at each end of the filter cylinder within the end cap-to-cylinder bonding area.
Claim 15
Dependent Claim
25 words
A filter element in accordance with claim 13, in which the end cap has a peripheral flange and the circumferential wrap is within the flange.
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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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |