US3112264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accordion folded filter element
Assignee: MSA Safety Inc
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Filing: 1961-09-19
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Granted: 1963-11-26
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Expires: 1981-09-19
Abstract
No abstract record available.
Inventors
- 👤 Robert A Bub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:22
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/016; B01D2201/00; B01D2201/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE COMBINATION WITH A PILE OF SUBSTANTIALLY ENGAGING FILTER SHEETS FORMED FROM AN ACCORDION FOLDED FILTER STRIP, OF A PLURALITY OF STACKS OF STIFF FLAT TONGUES DISPOSED BETWEEN SAID SHEETS PARALLEL THERETO, THE TONGUES IN EACH STACK BEING SPACED APART BY MEANS FLEXIBLY CONNECTING THE SIDE EDGES OF THEIR OUTER ENDS AND EXTENDING ACROSS THE STRIP FOLDS CONNECTING SAID SHEETS, EACH OF SAID CONNECTING MEANS EXTENDING ACROSS TWO OF SAID FOLDS AND HAVING SUBSTANTIALLY THE SAME WIDTH AS A TONGUE, SAID STACKS BEING ARRANGED IN LATERALLY SPACED PAIRS WITHTHE TONGUES OF ONE STACK INSERTED BETWEEN THE FOLDS STRADDLED BY THE OTHER STACK IN THE SME PAIR, AND SAID LATERALLY SPACED PAIRS OF STACKS BEING INSERTED BETWEEN THE SHEETS ALTERNATELY FROM
Claim 2
Dependent Claim
120 words
THE COMBINATION WITH A PILE OF SUBSTANTIALLY ENGAGING FILTER SHEETS FORMED FROM AN ACCORDION FOLDED FILTER STRIP, OF A PLURALITY OF STACKS OF STIFF FLAT TONGUES DISPOSED BETWEEN SAID SHEETS PARALLEL THERETO, THE TONGUES IN EACH STACK BEING SPACED APART BY MEANS FLEXIBLY CONNECTING THE SIDE EDGES OF THEIR OUTER ENDS AND EXTENDING ACROSS THE STRIP FOLDS CONNECTING SAID SHEETS, EACH OF SAID CONNECTING MEANS EXTENDING ACROSS TWO OF SAID FOLDS AND HAVING SUBSTANTIALLY THE SAME WIDTH AS A TONGUE, SAID STACKS BEING ARRANGED IN LATERALLY SPACED PAIRS WITHTHE TONGUES OF ONE STACK INSERTED BETWEEN THE FOLDS STRADDLED BY THE OTHER STACK IN THE SME PAIR, AND SAID LATERALLY SPACED PAIRS OF STACKS BEING INSERTED BETWEEN THE SHEETS ALTERNATELY FROM
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) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |