US3241680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Dana Inc
•
Filing: 1962-09-12
•
Granted: 1966-03-22
•
Expires: 1982-09-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Kingsley E Humbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:41
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A FILTER ELEMENT COMPRISING A PERFORATED CENTER TUBE, AN ANNULUS OF LONGITUDINAL PLEATED PAPER SURROUNDING SAID TUBE WITH THE INNER PEAKS OF THE PLEATS IN CONTACT WITH SAID TUBE, A STRING WRAPPED AROUND THE ANNULUS ACROSS THE OUTER PEAKS OF SAID PLEATS AND IN CONTACT THEREWITH, ADHESIVE MEANS SECURING SAID STRING TO THE INDIVIDUAL PLEATS, A BODY WRAPPED AROUND SAID ANNULUS AND THE SAID STRING AND IN CONTACT WITH SAID STRING, WITH SAID ADHESIVE MEANS SECURING SAID WRAPPER TO SAID STRING, AND END CAPS SEALING OFF THE OPPOSITE ENDS EDGES OF SAID PLEATS, THE SAID STRING BEING IN A SINGLE CONTINUOUS PIECE SPIRALLY WRAPPED AROUND SAID ANNULUS AND HAVING ITS ENDS SECURED BETWEEN SAID END CAPS AND THE OPPOSING END EDGES OF SAID PLEATS.
Claim 2
Dependent Claim
124 words
A FILTER ELEMENT COMPRISING A PERFORATED CENTER TUBE, AN ANNULUS OF LONGITUDINAL PLEATED PAPER SURROUNDING SAID TUBE WITH THE INNER PEAKS OF THE PLEATS IN CONTACT WITH SAID TUBE, A STRING WRAPPED AROUND THE ANNULUS ACROSS THE OUTER PEAKS OF SAID PLEATS AND IN CONTACT THEREWITH, ADHESIVE MEANS SECURING SAID STRING TO THE INDIVIDUAL PLEATS, A BODY WRAPPED AROUND SAID ANNULUS AND THE SAID STRING AND IN CONTACT WITH SAID STRING, WITH SAID ADHESIVE MEANS SECURING SAID WRAPPER TO SAID STRING, AND END CAPS SEALING OFF THE OPPOSITE ENDS EDGES OF SAID PLEATS, THE SAID STRING BEING IN A SINGLE CONTINUOUS PIECE SPIRALLY WRAPPED AROUND SAID ANNULUS AND HAVING ITS ENDS SECURED BETWEEN SAID END CAPS AND THE OPPOSING END EDGES OF SAID PLEATS.
References Cited (Backward Citations)
CA566327A
Cited
US1662726A
Cited
US2274113A
Cited
US2314640A
Cited
US2759610A
Cited
US2946450A
Cited
US2919807A
Cited
US2988227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |