Patent US3788486A successfully refreshed from Google Patents.
US3788486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: SSI Technologies LLC
•
Filing: 1971-09-30
•
Granted: 1974-01-29
•
Expires: 1991-09-30
Abstract
Abstract A rigid filter, useful for example for filtering molten thermoplastic resin as it is forced through a spinnerette head, comprising a rigid block of shaped uniformly permeable material, having continuity and identity of composition and having increased filtering capacity, with a plurality of filtration cavities extending into the block from the top surface and a plurality of drainage cavities extending into the block from the bottom surface.
Inventors
- 👤 T Bergstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:09
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/10; D01D1/106; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D29/33
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A unitary, rigid filter structure comprising a permeable block of consolidated, particulate material free of protuberances and having a top surface with a plurality of blind filtration cavities vertically extending into the block from inlet openings located wholly in said top surface, and an opposing surface with a plurality of blind drainage cavities vertically extending into the block from outlet openings located wholly in said opposing surface, said cavities being spaced apart from one another and spaced from the vertical outer periphery of said block.
Claim 2
Dependent Claim
85 words
A unitary, rigid filter structure comprising a permeable block of consolidated, particulate material free of protuberances and having a top surface with a plurality of blind filtration cavities vertically extending into the block from inlet openings located wholly in said top surface, and an opposing surface with a plurality of blind drainage cavities vertically extending into the block from outlet openings located wholly in said opposing surface, said cavities being spaced apart from one another and spaced from the vertical outer periphery of said block.
Claim 3
Dependent Claim
15 words
The filter according to claim 1 wherein said porous material comprises sintered powdered stainless steel.
Claim 4
Dependent Claim
15 words
The filter according to claim 1 wherein said particulate material comprises epoxy bonded glass beads.
Claim 5
Dependent Claim
15 words
The filter according to claim 1 wherein said particulate material comprises sintered powdered ceramic material.
Claim 6
Dependent Claim
115 words
A unitary, uniformly permeable filter structure comprising a cylindrical, permeable block of consolidated, sintered powdered metal with a base portion having a cross-sectional area greater than one square inch in minimum dimension, said base having a plurality of blind drainage cavities vertically extending into the block from outlet openings located wholly in the bottom surface of said block, and having an opposed extended area filtration surface defined by a plurality of blind filtration cavities vertically extending into the block from inlet openings located wholly in the top surface of said block, said cavities being spaced apart from one another and spaced from the vertical outer periphery of said block, said block being free of protuberances.
Claim 7
Dependent Claim
115 words
A unitary, uniformly permeable filter structure comprising a cylindrical, permeable block of consolidated, sintered powdered metal with a base portion having a cross-sectional area greater than one square inch in minimum dimension, said base having a plurality of blind drainage cavities vertically extending into the block from outlet openings located wholly in the bottom surface of said block, and having an opposed extended area filtration surface defined by a plurality of blind filtration cavities vertically extending into the block from inlet openings located wholly in the top surface of said block, said cavities being spaced apart from one another and spaced from the vertical outer periphery of said block, said block being free of protuberances.
Claim 8
Dependent Claim
142 words
A filtration assembly comprising in combination: a housing having an inlet and outlet with a filter chamber disposed within said housing, a unitary, rigid, filter structure disposed within said filter chamber, said filter structure comprising a permeable block of consolidated, particulate material having a top surface with a plurality of blind filtration cavities extending into the block from inlet openings located wholly in said top surface, and an opposing surface with a plurality of blind drainage cavities extending in the block from outlet openings located wholly in said opposing surface, said filtration cavities being in communication with said inlet via said inlet openings and said drainage cavities being in communication with said outlet via said outlet openings, said block being free of protuberances, and said cavities being spaced apart from one another and spaced from the vertical outer periphery of said block.
Claim 9
Dependent Claim
142 words
A filtration assembly comprising in combination: a housing having an inlet and outlet with a filter chamber disposed within said housing, a unitary, rigid, filter structure disposed within said filter chamber, said filter structure comprising a permeable block of consolidated, particulate material having a top surface with a plurality of blind filtration cavities extending into the block from inlet openings located wholly in said top surface, and an opposing surface with a plurality of blind drainage cavities extending in the block from outlet openings located wholly in said opposing surface, said filtration cavities being in communication with said inlet via said inlet openings and said drainage cavities being in communication with said outlet via said outlet openings, said block being free of protuberances, and said cavities being spaced apart from one another and spaced from the vertical outer periphery of said block.
Claim 10
Dependent Claim
53 words
A unitary, rigid filter structure comprising a permeable block of consolidated, particulate material free of protuberances and having a top surface with a plurality of blind filtration cylindrical chambers vertically extending therefrom into the block and an opposing surface with a plurality of blind drainage cylindrical chambers vertically extending therefrom into the block.
Claim 11
Dependent Claim
53 words
A unitary, rigid filter structure comprising a permeable block of consolidated, particulate material free of protuberances and having a top surface with a plurality of blind filtration cylindrical chambers vertically extending therefrom into the block and an opposing surface with a plurality of blind drainage cylindrical chambers vertically extending therefrom into the block.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |