US3919089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tightening filter assembly
Assignee: REFACCIONES PLASTICAS Y METALI
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Filing: 1973-06-01
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Granted: 1975-11-11
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Expires: 1993-06-01
Abstract
Abstract A filter or strainer capable of being self-tightened when the mesh thereof becomes loose and hung at the central region thereof, thus decreasing the efficiency thereof upon changing the opening or mesh size in said region; said strainer reassuming the tightened condition by means of a device capable of gradually restoring the original condition of a replaceable straining unit.
Inventors
- 👤 Guillermo Gonzalez Gonzalez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:00
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
SELF-TIGHTENING STRAINING ASSEMBLY COMPRISNG, A MAIN BODY COMPRISED OF TWO SECTIONS WHICH ARE TELESCOPINGLY SECURED TO EACH OTHER BY MEANS OF THREADS, A SIEVE IS BETWEEN SAID SECTIONS AND HAVING ITS OUTER SIEVE MARGIN SUPPORTED ON AN INNER SHOULDER OF SAID LOWER SECTION OF SAID BODY, THE UPPER SECTION OF SAID BODY BEING PROVIDED WITH AN INNER RADIALLY AND AXIALLY INWARDLY EXTENDING ANNULAR PROJECTION WHICH PROJECTS RADIALLY INWARDLY OF SAID AXIALLY BEYOND SAID SHOULDER THAT SUPPORTS SAID OUTER SIEVE MARGIN, THE INNER MOST END OF SAID PROJECTION BEING POSITIONED AND ENGAGEABLE WITH A CENTER SECTION OF THE SIEVE WHICH IS FREE OF SAID SHOULDER AND ANY BOTTOM SIDE SUPPORT AND WITH THE CENTER SECTION BEING IN RADIALLY INWARDLY SPACED RELATION WITH RESPECT TO SAID OUTER SIEVE MARGIN, SAID SECTIONS BEING THREADINGLY ENGAGED TO SECURELY CLAMP SAID OUTER SIEVE MARGIN IN FIXED ASSEMBLY ON SAID SHOULDER BETWEEN SAID SECTIONS, THE OUTER SIEVE MARGIN AND THE CENTER SIEVE SECTION BEING CONSTRUCTED AND ARRANGED WHEREBY THE POSITION OF THE THREADS CAN BE ADJUSTED TO ENABLE A VARIABLE TIGHTENING ACTION TO BE EXPERTED BY SAID LOWERMOST END OF SAID ANNULAR PROJECTION AGAINST SECTION OF SAID SIEVE.
Claim 2
Dependent Claim
192 words
SELF-TIGHTENING STRAINING ASSEMBLY COMPRISNG, A MAIN BODY COMPRISED OF TWO SECTIONS WHICH ARE TELESCOPINGLY SECURED TO EACH OTHER BY MEANS OF THREADS, A SIEVE IS BETWEEN SAID SECTIONS AND HAVING ITS OUTER SIEVE MARGIN SUPPORTED ON AN INNER SHOULDER OF SAID LOWER SECTION OF SAID BODY, THE UPPER SECTION OF SAID BODY BEING PROVIDED WITH AN INNER RADIALLY AND AXIALLY INWARDLY EXTENDING ANNULAR PROJECTION WHICH PROJECTS RADIALLY INWARDLY OF SAID AXIALLY BEYOND SAID SHOULDER THAT SUPPORTS SAID OUTER SIEVE MARGIN, THE INNER MOST END OF SAID PROJECTION BEING POSITIONED AND ENGAGEABLE WITH A CENTER SECTION OF THE SIEVE WHICH IS FREE OF SAID SHOULDER AND ANY BOTTOM SIDE SUPPORT AND WITH THE CENTER SECTION BEING IN RADIALLY INWARDLY SPACED RELATION WITH RESPECT TO SAID OUTER SIEVE MARGIN, SAID SECTIONS BEING THREADINGLY ENGAGED TO SECURELY CLAMP SAID OUTER SIEVE MARGIN IN FIXED ASSEMBLY ON SAID SHOULDER BETWEEN SAID SECTIONS, THE OUTER SIEVE MARGIN AND THE CENTER SIEVE SECTION BEING CONSTRUCTED AND ARRANGED WHEREBY THE POSITION OF THE THREADS CAN BE ADJUSTED TO ENABLE A VARIABLE TIGHTENING ACTION TO BE EXPERTED BY SAID LOWERMOST END OF SAID ANNULAR PROJECTION AGAINST SECTION OF SAID SIEVE.
Claim 3
Dependent Claim
33 words
The assembly of claim 1 further characterized by said outer sieve margin having a thickness in excess of the center section of the sieve to facilitate clamping of the sieve between said sections.
Claim 4
Dependent Claim
51 words
The assembly of claim 1 further characterized by said center section of the sieve having a reduced thickness as compared to the outer margin of said sieve so that when the threads are adjusted said projection can cause a tightening action to be exerted against the center section of the sieve.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |