Patent US3255889A successfully refreshed from Google Patents.
US3255889A
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Assignee: AMF Inc
•
Filing: 1961-04-10
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Granted: 1966-06-14
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Expires: 1981-04-10
Abstract
No abstract record available.
Inventors
- 👤 Joshua H Goldman
- 👤 Philip E Ashton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:50
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/001; B01D25/22; B01D25/24; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
A FILTER CARTRIDGE COMPRISING A SUBSTANTIALLY CYLINDRICAL FORAMINOUS BODY HAVING A PLURALITY OF INTEGRAL RADIALLY EXTENDING PROTRUSIONS AT EACH END THEREOF AND A PLURALITY OF HELICALLY WOUND CRISSCROSSING COURSES OF AXIALLY SPACED CONTINUOUS STRAND MATERIAL, AT LEST SOME OF THE FIRST COURSES BEING ANCHORED AS WOUND ABOUT SAID PROTRUSIONS.
References Cited (Backward Citations)
GB189700618A
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US2035758A
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US2097828A
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US2368216A
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FR1114777A
Cited
US2980354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |