Patent US3868327A successfully refreshed from Google Patents.
US3868327A
Expired / Lapsed
US
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Filter unit for fluid cleaner
Assignee: Skyway Sales Corp
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Filing: 1973-03-12
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Granted: 1975-02-25
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Expires: 1993-03-12
Abstract
Abstract A filter unit includes a toroid made up of flat discshaped layers of absorbant tissue paper such as toilet paper stacked one on top of the other; a cylindrical core extending up through the center opening of the toroid, having openings therethrough for the passage of the fluid being cleaned, and spaced from the interior surface of the paper; and impervious end plates in sealing relation to the two spaced apart parallel outer end surfaces of the toroid. The tensioning between all adjacent tissue paper layers is accurately controlled to insure that a proper filtering action will be achieved in accordance with the nature of the fluid being filtered, the nature of the impurities, the rate of flow, and the permissible pressure loss through the fluid cleaner and other factors. This tensioning is achieved at the point of initial manufacture of the filter unit by accurately controlling the thickness and number of layers of filter paper used and the positioning and tensioning of the impervious end plates when they are fixedly mounted with respect to the filter paper toroid and with respect to the pervious core or a pervious outer cylindrical casement. The filter unit is assembled in the cannister of a fluid cleaner so that the flow of fluid is to the entire outer periphery of the filter paper toroid, radially inwardly to the hollow center of the toroid, and out through the cylindrical pervious center core.
Inventors
- 👤 Gilder James F Van
- 👤 Donald R Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:31
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/08; B01D27/10; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D35/00; B01D35/14; B01D35/153; B01D35/157; B01D35/1576; B01D2201/00; B01D2201/18; B01D2201/182
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
The method of making a filter unit including the steps of: A. stacking a plurality of identically sized, flat sheets of toilet paper grade filter paper one on the other in face to face relationship to each other; B. placing impervious end plates of substantially the same shape as the individual sheets of filter paper in sealing relation to the end sheets of the stack; C. exerting a pressure on the outer surfaces of said plates to achieve a desired, predetermined pressure between adjacent filter paper sheets; and D. fastening these end plates with respect to each other to maintain the desired pressure between the filter paper sheets.
Claim 2
Independent Claim
108 words
The method of making a filter unit including the steps of: A. stacking a plurality of identically sized, flat sheets of toilet paper grade filter paper one on the other in face to face relationship to each other; B. placing impervious end plates of substantially the same shape as the individual sheets of filter paper in sealing relation to the end sheets of the stack; C. exerting a pressure on the outer surfaces of said plates to achieve a desired, predetermined pressure between adjacent filter paper sheets; and D. fastening these end plates with respect to each other to maintain the desired pressure between the filter paper sheets.
Claim 3
Dependent Claim
68 words
The method of claim 1 wherein said end plates are rigid, wherein said filter paper sheets are disc-shaped, having a circular opening therethrough; wherein a pervious generally cylindrical core member extends between the plates up through the interior opening and the filter paper sheets; and wherein the step of fastening the plates with respect to each other includes the fastening of each plate to said pervious core member.
Claim 4
Dependent Claim
73 words
The method of claim 2 wherein there is pervious casement extending between the plates, wherein the size and shape of the filter paper sheets is such as to substantially fill the cross sectional area of the casement but to be spaced from the interior surface of the casement; then wherein the step of fastening the two end plates with respect to each other includes fastening each of the end plates to the casement.
Claim 5
Dependent Claim
46 words
The method of claim 1 wherein there is a pervious casement extending between the end plates; wherein the end plates are rigId; and wherein the step of fastening the two plates in fixed relation to each other includes the fastening of each plate to the casement.
Claim 6
Dependent Claim
201 words
A filter unit for use in a fluid cleaner having a fluid tight outside cannister providing an open cannister chamber, an inlet pipe open from outside to the inside of the cannister, an outlet pipe having an inner end open from a central portion of said cannister chamber to the outside of said cannister; said filter unit including: A. a plurality of identically sized flat sheets of toilet paper grade filter paper stacked one on the other in face to face relation; B. a pair of impervious end plates of substantially the same size as the individual sheets of filter paper and each in sealing relation to an outer end of said sheets; C. each of said sheets being provided with a central opening therein, said stacked sheets thereby defining a central core compartment, said end plates serving to seal said central core compartment from the remainder of said cannister chamber; D. said outlet pipe extending through one of said end plates into said central core compartment in sealing relation to said end plate; and E. means for fixedly positioning said end plates with respect to each other to achieve a desired predetermined pressure between the individual sheets of filter paper.
Claim 7
Dependent Claim
201 words
A filter unit for use in a fluid cleaner having a fluid tight outside cannister providing an open cannister chamber, an inlet pipe open from outside to the inside of the cannister, an outlet pipe having an inner end open from a central portion of said cannister chamber to the outside of said cannister; said filter unit including: A. a plurality of identically sized flat sheets of toilet paper grade filter paper stacked one on the other in face to face relation; B. a pair of impervious end plates of substantially the same size as the individual sheets of filter paper and each in sealing relation to an outer end of said sheets; C. each of said sheets being provided with a central opening therein, said stacked sheets thereby defining a central core compartment, said end plates serving to seal said central core compartment from the remainder of said cannister chamber; D. said outlet pipe extending through one of said end plates into said central core compartment in sealing relation to said end plate; and E. means for fixedly positioning said end plates with respect to each other to achieve a desired predetermined pressure between the individual sheets of filter paper.
Claim 8
Dependent Claim
58 words
The combination of claim 5 wherein said sheets of filter paper are disc-shaped in configuration and said central opening therein is in concentric alignment with the outer surface of said sheets, thus to provide a substantially cylindrical core compartment in concentric relationship to a provided cylindrical outer surface of the filter unit of stacked sheets of filter paper.
Claim 9
Dependent Claim
38 words
The combination of claim 6 and a substantially cylindrical pervious core extending from end plate to end plate within the core compartment, said inner end of said outlet pipe being open to the inside of said pervious core.
Claim 10
Dependent Claim
21 words
The combination of claim 7, and a pervious cylindrical casement extending from end plate to end plate in sealing relation thereto.
Claim 11
Dependent Claim
44 words
The combination of claim 8 wherein said pervious casement is provided with holes or openings of a size sufficiently large to allow easy visual inspection of any filtered particles or materials which have been deposited on the outer cylindrical surface of the filter medium.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |