US2654440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element formed of paper impregnated with thermoplastic resin
Assignee: Fram Corp
•
Filing: 1951-10-18
•
Granted: 1953-10-06
•
Expires: 1971-10-18
Abstract
No abstract record available.
Inventors
- 👤 Robinson John Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; B01D39/00; B01D39/14; B01D39/16; B01D39/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A FILTER ELEMENT COMPRISING A PLURALITY OF CELLS HAVING CENTER OPENINGS IN AXIAL ALIGNMENT PROVIDING AN AXIAL PASSAGE, EACH CELL COMPRISING A PAIR OF SHEETS OF PAPER CONTACTING AT THEIR OUTER PERIPHERY AND PROVIDED WITH REGISTERING CENTER APERTURES FORMING SAID PASSAGE WITH THE APERTURE EDGES SPACED TO COMMUNICATE WITH THE SAID PASSAGE, SAID PAPER SHEETS HAVING A POROSITY OF FROM
Claim 2
Dependent Claim
60 words
A FILTER ELEMENT COMPRISING A PLURALITY OF CELLS HAVING CENTER OPENINGS IN AXIAL ALIGNMENT PROVIDING AN AXIAL PASSAGE, EACH CELL COMPRISING A PAIR OF SHEETS OF PAPER CONTACTING AT THEIR OUTER PERIPHERY AND PROVIDED WITH REGISTERING CENTER APERTURES FORMING SAID PASSAGE WITH THE APERTURE EDGES SPACED TO COMMUNICATE WITH THE SAID PASSAGE, SAID PAPER SHEETS HAVING A POROSITY OF FROM
References Cited (Backward Citations)
US1989795A
Cited
US2569243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |