US3305098A
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Assignee: Walker Manufacturing Co
•
Filing: 1961-11-17
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Granted: 1967-02-21
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Expires: 1981-11-17
Abstract
No abstract record available.
Inventors
- 👤 Craig H Cowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D2201/00; B01D2201/04; B01D2201/0407; B01D2201/0415; B01D2201/0423; B01D2201/40; B01D2201/4084
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
IN A PAPER FILTER SHELL OR THE LIKE, HAVING ABUTTING AND OVERLAPPED END PORTIONS, INTEGRAL CONTINUOUS ONEPIECE ELONGATED TAB MEANS FORMED IN ONE OF SAID END PORTIONS, OPPOSITE ENDS OF SAID TAB MEANS BEING INTEGRALLY CONNECTED TO SAID ONE OF SAID END PORTIONS AND SAID TAB MEANS BEING CONTINUOUS BETWEEN SAID OPPOSITE ENDS, THE SIDE PORTIONS OF SAID TAB MEANS BETWEEN SAID OPPOSITE ENDS BEING SEVERED FROM SAID ONE OF SAID END PORTIONS ALONG OUTWARDLY CURVED LINES TO DEFINE TAB MEANS HAVING A MAXIMUM WIDTH CENTER PORTION AND MINIMUM WIDTH OPPOSITE ENDS WITH THE TAB MEANS GRADUALLY CHANGING IN WIDTH BETWEEN SAID MAXIMUM WIDTH CENTER PORTION AND
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |