Patent US3238707A successfully refreshed from Google Patents.
US3238707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Individual
•
Filing: 1963-02-13
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Granted: 1966-03-08
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Expires: 1983-02-13
Abstract
No abstract record available.
Inventors
- 👤 Henry J Witkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:02
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A FILTER COMPRISING A FLAT MOUNTING PLATE WITH AN OPENING THERETHROUGH, A BASE, SAID BASE HAVING AN UPWARDLY EXTENDING SIDE, AN INWARDLY EXTENDING MEMBER ON SAID BASE ADAPTED TO SNAP OVER AND UNDERLIE SAID MOUNTING PLATE, AN OUTWARDLY EXTENDING BEAD ON THE OUTSIDE OF SAID BASE, A COVER IN THE FORM OF A CUP-SHAPED MEMBER HAVING A CLOSED END AND SIDES WITH SLOTS IN SAID CLOSED END, THE RIM OF SAID CUP-SHAPED MEMBER RECEIVING SAID OUTWARDLY EXTENDING BEAD THEREIN, MEANS ON SAID RIM AND EXTENDING CONTINUOUSLY THEREAROUND UNDERLYING SAID BEAD ON SAID BASE AND ADAPTED TO SNAP OVER SAID BEAD TO REMOVE SAID CUP-SHAPED MEMBER THEREFROM, AND A BLOCK OF FOAM MATERIAL RESTING ON SAID BASE AND SEALINGLY ENGAGING SAID BASE.
Claim 2
Dependent Claim
121 words
A FILTER COMPRISING A FLAT MOUNTING PLATE WITH AN OPENING THERETHROUGH, A BASE, SAID BASE HAVING AN UPWARDLY EXTENDING SIDE, AN INWARDLY EXTENDING MEMBER ON SAID BASE ADAPTED TO SNAP OVER AND UNDERLIE SAID MOUNTING PLATE, AN OUTWARDLY EXTENDING BEAD ON THE OUTSIDE OF SAID BASE, A COVER IN THE FORM OF A CUP-SHAPED MEMBER HAVING A CLOSED END AND SIDES WITH SLOTS IN SAID CLOSED END, THE RIM OF SAID CUP-SHAPED MEMBER RECEIVING SAID OUTWARDLY EXTENDING BEAD THEREIN, MEANS ON SAID RIM AND EXTENDING CONTINUOUSLY THEREAROUND UNDERLYING SAID BEAD ON SAID BASE AND ADAPTED TO SNAP OVER SAID BEAD TO REMOVE SAID CUP-SHAPED MEMBER THEREFROM, AND A BLOCK OF FOAM MATERIAL RESTING ON SAID BASE AND SEALINGLY ENGAGING SAID BASE.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |