Patent US4422861A successfully refreshed from Google Patents.
US4422861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerosol filter cartridge
Assignee: Cabot Safety Intermediate LLC
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Filing: 1982-02-05
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Granted: 1983-12-27
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Expires: 2002-02-05
Abstract
Abstract A circular array of accordian pleated filter material is core and edge sealed, placed in a supporting shell, peripherally sealed thereinplace and capped. Core sealing of the array of filter material is accomplished with a fill of hot melt adhesive and edge sealing with application of a covering strip of the same or a similar hot melt adhesive. An overlay of heat shrinkable tape provides final tight sealing and rigidification of the structure.
Inventors
- 👤 Robert J. Dusza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/10; B01D46/106; B01D2265/00; B01D2265/04; Y; Y10; Y10S; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
A filter for a respirator cartridge, said filter comprising: an encirclement of an accordian pleated filter medium with opposite ends joined and providing an open core area so as to define open internal and external edges of pleating of said encirclement; first adhesive means sealing together said joined opposite ends of said encirclement of filter medium; second adhesive means filling said core area as a seal for said internal open edges of said pleating; third adhesive means extending about said external open edges of pleating for covering and sealing said external open edges of said pleating, said third adhesive means comprising a hot melt adhesive strip; a layer of heat shrinkable material overlying said third adhesive means; and said third adhesive means and said layer of heat shrinkable material being respectively heat softened and heat shrunken tightly against said encirclement of pleated filter medium so as to effect positive sealing of said external open edges of said pleated medium and rigidifying of said encirclement of filter medium.
Claim 2
Dependent Claim
167 words
A filter for a respirator cartridge, said filter comprising: an encirclement of an accordian pleated filter medium with opposite ends joined and providing an open core area so as to define open internal and external edges of pleating of said encirclement; first adhesive means sealing together said joined opposite ends of said encirclement of filter medium; second adhesive means filling said core area as a seal for said internal open edges of said pleating; third adhesive means extending about said external open edges of pleating for covering and sealing said external open edges of said pleating, said third adhesive means comprising a hot melt adhesive strip; a layer of heat shrinkable material overlying said third adhesive means; and said third adhesive means and said layer of heat shrinkable material being respectively heat softened and heat shrunken tightly against said encirclement of pleated filter medium so as to effect positive sealing of said external open edges of said pleated medium and rigidifying of said encirclement of filter medium.
Claim 3
Dependent Claim
23 words
A filter according to claim 1 wherein said filter medium is a filter paper and said first and second adhesives are hot melts.
Claim 4
Dependent Claim
15 words
A filter according to claim 2 wherein said heat shrinkable material is a polyethylene tape.
Claim 5
Dependent Claim
33 words
A filter according to claim 1 further including an open ended shell into which said encirclement of filter medium is loosely positioned, there being space between said encirclement of filter medium and shell.
Claim 6
Dependent Claim
29 words
A filter according to claim 4 wherein said space between said encirclement of filter medium and shell is closed and sealed adjacent one end of said open ended shell.
Claim 7
Dependent Claim
23 words
A filter according to claim 5 wherein said closing and sealing of said space is accomplished with a continuous bead of adhesive material.
Claim 8
Dependent Claim
19 words
A filter according to claim 6 further including a cover extending over another end of said open ended shell.
Claim 9
Dependent Claim
25 words
A filter according to claim 6 wherein said cover and said closed one end of said shell are perforated to permit passage of air therethrough.
Claim 10
Dependent Claim
31 words
A filter according to claim 8 wherein said shell, said filter medium and said cover comprise a respirator cartridge component, said component including means for its adaptation to a respirator facepiece.
Claim 11
Dependent Claim
29 words
A filter according to claim 9 wherein said means for adapting said cartridge component to a respirator facepiece comprises external threads adjacent one of said ends of said shell.
References Cited (Backward Citations)
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |