US4664684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter unit
Assignee: Cummins Engine IP Inc
•
Filing: 1986-01-30
•
Granted: 1987-05-12
•
Expires: 2006-01-30
Abstract
Abstract An air filter unit is provided for use with an internal combustion engine. The unit includes inner and outer sleeves, a filter medium disposed intermediate the sleeves, and end plates affixed to and overlying the corresponding ends of the sleeves and filter medium. At least the outer sleeve is formed from a blank of foraminous, relatively stiff, sheet material with the periphery thereof including burr-forming peripheral portions and an elongated peripheral portion folded back upon itself to form a hem-like segment. The blank is then formed into a cylindrical sleeve with the hem-like segment overlapping and being affixed to a burr-forming peripheral portion opposite the hem-like segment so as to form an elongated seam extending the length of the sleeve. The overlapped seam-forming peripheral portion being exposed only on an interior surface of the sleeve.
Inventors
- 👤 Kinion H. Dunn
- 👤 Michael L. Pack
- 👤 Sonja H. Holzhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:15
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2411
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
An air filter unit for use with an internal combustion engine comprising an elongated filter medium; an elongated outer sleeve encompassing said filter medium; and end plates affixed to and overlying corresponding ends of said sleeve and filter medium, said outer sleeve having an elongated longitudinally extending external seam and being formed from a blank of relatively stiff, foraminous sheet material with the periphery thereof including burr-forming peripheral longitudinal portions and an elongated peripheral longitudinal portion folded back under upon itself to form a hem segment, said blank being formed into a cylindrical sleeve with the hem segment having the folded back portion thereof disposed on the interior of said sleeve and overlapping and being affixed to a burr-forming peripheral longitudinal portion opposite said hem segment to form said elongated seam extending the length of said sleeve, the overlapped seam-foaming peripheral longitudinal portion being exposed only on an interior surface of the sleeve.
Claim 2
Dependent Claim
153 words
An air filter unit for use with an internal combustion engine comprising an elongated filter medium; an elongated outer sleeve encompassing said filter medium; and end plates affixed to and overlying corresponding ends of said sleeve and filter medium, said outer sleeve having an elongated longitudinally extending external seam and being formed from a blank of relatively stiff, foraminous sheet material with the periphery thereof including burr-forming peripheral longitudinal portions and an elongated peripheral longitudinal portion folded back under upon itself to form a hem segment, said blank being formed into a cylindrical sleeve with the hem segment having the folded back portion thereof disposed on the interior of said sleeve and overlapping and being affixed to a burr-forming peripheral longitudinal portion opposite said hem segment to form said elongated seam extending the length of said sleeve, the overlapped seam-foaming peripheral longitudinal portion being exposed only on an interior surface of the sleeve.
Claim 3
Dependent Claim
38 words
The air filter unit of claim 1 wherein the hem peripheral segment is affixed by welding to the overlapped seam-forming peripheral portion of the sleeve blank; the formed weld being substantially recessed from the exterior of said sleeve.
Claim 4
Dependent Claim
17 words
The air filter unit of claim 1 wherein the sleeve blank is of expanded metal sheet material.
Claim 5
Dependent Claim
29 words
The air filter unit of claim 1 wherein the foldback portion of the hem peripheral segment defines a substantially burr-less exposed foldline forming an elongated edge of the seam.
Claim 6
Dependent Claim
31 words
The air filter unit of claim 1 wherein the burr-forming peripheral longitudinal portions of said sleeve blank defining the ends of said sleeve are concealed by the end plates affixed thereto.
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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |