US4056876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a filter
Assignee: Robert Bosch GmbH
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Filing: 1976-09-10
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Granted: 1977-11-08
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Expires: 1996-09-10
Abstract
Abstract A filter element is fitted into a filter can and a mass of hot-melt adhesive between the filter element and the can is thermally activated and allowed to cure to hold this filter element in place. A bead of hot-melt adhesive is applied to the rim of the can and the edge of a cover is applied over this bead which may be heated to its softening range. Thereafter the rim of the can is bent over the edge of the cover and this bent-over rim is heated to the melting point of the hot-melt adhesive so as to secure the two together once the hot-melt adhesive has cured.
Inventors
- 👤 Heinz Lammermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:37
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/06; B01D27/07; B01D27/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49906; Y10T29/49908; Y10T29/49915; Y10T29/49917; Y10T29/49918
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A method of closing a metal filter can comprising the steps of sequentially: providing around an annular shoulder adjacent the rim of an open side of said filter can an annular line of a hot-melt adhesive in nonliquid form; applying a metal cover over said open side with its edge in contact with said annular line of adhesive in nonliquid form; bending over said rim around said edge and thereby pressing said edge against said line and through said line against said shoulder; heating the bent over rim to melt said adhesive; and curing said adhesive.
Claim 2
Independent Claim
96 words
A method of closing a metal filter can comprising the steps of sequentially: providing around an annular shoulder adjacent the rim of an open side of said filter can an annular line of a hot-melt adhesive in nonliquid form; applying a metal cover over said open side with its edge in contact with said annular line of adhesive in nonliquid form; bending over said rim around said edge and thereby pressing said edge against said line and through said line against said shoulder; heating the bent over rim to melt said adhesive; and curing said adhesive.
Claim 3
Dependent Claim
30 words
The method defined in claim 1 further comprising the step of heating said rim prior to provision of said line to a temperature in the softening range of said adhesive.
Claim 4
Dependent Claim
22 words
The method defined in claim 1 wherein said rim is annular and said line is formed as an annulus within said rim.
Claim 5
Dependent Claim
36 words
The method defined in claim 3 wherein said rim has a shoulder and said annulus is provided on said shoulder, said rim being bent over adjacent said shoulder to press said edge down on said shoulder.
Claim 6
Dependent Claim
27 words
The method defined in claim 1 wherein said rim is heated by conduction with a tool heated to a temperature above the melting point of said adhesive.
Claim 7
Dependent Claim
33 words
The method defined in claim 1, further comprising the step of prior to application of said cover heating said rim and said line to a temperature in the softening range of said adhesive.
Claim 8
Dependent Claim
32 words
The method defined in claim 1, further comprising the steps of prior to provision of said line: mounting a filter element inside said can; and adhesively securing said element to said container.
Claim 9
Dependent Claim
50 words
The method defined in claim 7 wherein said element is adhesively secured in said can by providing a hot-melt adhesive mass between said element and an inner surface of said can, thereafter heating said can at said mass to the melting point of said mass, and thereafter curing said mass.
Claim 10
Dependent Claim
18 words
The method defined in claim 8 wherein said line and said mass are of the same polyamide composition.
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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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |