US3177637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filters
Assignee: Individual
•
Filing: 1960-11-10
•
Granted: 1965-04-13
•
Expires: 1980-11-10
Abstract
No abstract record available.
Inventors
- 👤 Davis Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:09
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/0002; B01D46/0013; B01D46/10; B01D46/12; B01D46/121; F; F24; F24F; F24F13/00; F24F13/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A FILTER COMPRISING A POROUS SHEET FOLDED TO FORM PARALLEL CORRUGATIONS EXTENDING FROM ONE OF TWO OPPOSITE EDGES OF SAID SHEET TO THE OTHER, SIDE PIECES SECURED TO SAID OPPOSITE SHEET EDGES AND BRIDGING AND SECURED TO THE ENDS OF SAID CORRUGATIONS, THE PORTIONS OF SAID SHEET ADJACENT ITS REMAINING EDGES FORMING WITH SAID SIDE PIECES A PERIPHERAL WALL OF SAID SHEET, BOTH SAID SHEET AND SIDE PIECES BEING MADE OF A RESILIENT COMPRESSIBLE FILTER MATERIAL AND FORMING TOGETHER A BODY HAVING TWO MAIN FACES SURROUNDED AND SPACED BY SAID PERIPHERAL WALL, A FRAME COMPRISING A PAIR OF SEPARABLE FRAME MEANS PERIPHERALLY SURROUNDING SAID MAIN FACES, SAID PERIPHERAL WALL BEING SANDWICHED BETWEEN SAID FRAME MEANS, AND MEANS RELEASABLY CONNECTING SAID SEPARABLE FRAME MEANS AND RETAINING THEM AT A DISTANCE FROM EACH OTHER LESS THAN THE UNCOMPRESSED THICKNESS OF SAID SIDE PIECES TAKEN IN A DIRECTION PERPENDICULAR TO SAID MAIN FACES, THEREBY COMPRESSING SAID PIECES BETWEEN SAID FRAME MEANS TO RESTRICT THE PASSAGE OF FLUID BETWEEN SAID SIDE PIECES AND FRAME MEANS.
Claim 2
Dependent Claim
171 words
A FILTER COMPRISING A POROUS SHEET FOLDED TO FORM PARALLEL CORRUGATIONS EXTENDING FROM ONE OF TWO OPPOSITE EDGES OF SAID SHEET TO THE OTHER, SIDE PIECES SECURED TO SAID OPPOSITE SHEET EDGES AND BRIDGING AND SECURED TO THE ENDS OF SAID CORRUGATIONS, THE PORTIONS OF SAID SHEET ADJACENT ITS REMAINING EDGES FORMING WITH SAID SIDE PIECES A PERIPHERAL WALL OF SAID SHEET, BOTH SAID SHEET AND SIDE PIECES BEING MADE OF A RESILIENT COMPRESSIBLE FILTER MATERIAL AND FORMING TOGETHER A BODY HAVING TWO MAIN FACES SURROUNDED AND SPACED BY SAID PERIPHERAL WALL, A FRAME COMPRISING A PAIR OF SEPARABLE FRAME MEANS PERIPHERALLY SURROUNDING SAID MAIN FACES, SAID PERIPHERAL WALL BEING SANDWICHED BETWEEN SAID FRAME MEANS, AND MEANS RELEASABLY CONNECTING SAID SEPARABLE FRAME MEANS AND RETAINING THEM AT A DISTANCE FROM EACH OTHER LESS THAN THE UNCOMPRESSED THICKNESS OF SAID SIDE PIECES TAKEN IN A DIRECTION PERPENDICULAR TO SAID MAIN FACES, THEREBY COMPRESSING SAID PIECES BETWEEN SAID FRAME MEANS TO RESTRICT THE PASSAGE OF FLUID BETWEEN SAID SIDE PIECES AND FRAME MEANS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |