Patent US4928581A successfully refreshed from Google Patents.
US4928581A
Expired / Lapsed
US
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Negative air control unit and closure structure
Assignee: Individual
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Filing: 1988-11-30
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Granted: 1990-05-29
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Expires: 2008-11-30
Abstract
Abstract A portable negative air control unit and closure structure which can be utilized therewith to form enumerable different configurations. The basic unit includes a base which can be a shower containment pool, at least one closure structure having a door therein and top and side fabric walls which are removably attached to the closure structure, such as by zippers. The unit also can be attached to additional walls to form one of several interconnected units.
Inventors
- 👤 Earl B. Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:04
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/026
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A door closure structure for utilization in negative air control modules having walls and a base, said structure comprising: a structure door frame having an inner peripheral edge and an outer periphery including at least one wall attaching means sealingly secured thereto around said periphery, said attaching means are zipper means and include an outer sealing flap over said zipper means; a door panel mounted to said frame, including a rectangular frame having an outer peripheral edge and a fabric covering sealingly secured to said rectangular frame and extending beyond said inner peripheral edge, to seal against said structure door frame; and said door frame including means for mounting said structure door frame into the base.
Claim 2
Dependent Claim
116 words
A door closure structure for utilization in negative air control modules having walls and a base, said structure comprising: a structure door frame having an inner peripheral edge and an outer periphery including at least one wall attaching means sealingly secured thereto around said periphery, said attaching means are zipper means and include an outer sealing flap over said zipper means; a door panel mounted to said frame, including a rectangular frame having an outer peripheral edge and a fabric covering sealingly secured to said rectangular frame and extending beyond said inner peripheral edge, to seal against said structure door frame; and said door frame including means for mounting said structure door frame into the base.
Claim 3
Dependent Claim
29 words
The closure structure as defined in claim 1 wherein said mounting means include a pair of pipes adapted to mount at one end thereof into bores in said base.
Claim 4
Dependent Claim
25 words
The closure structure as defined in claim 1 wherein said door panel outer peripheral edge is sized smaller than said door frame inner peripheral edge.
Claim 5
Dependent Claim
36 words
The closure structure as defined in claim 1 wherein said zipper means includes a pair of zipper structures forming a two sided zipper assembly, both covered by said outer sealing flap to prevent air flow therethrough.
Claim 6
Dependent Claim
30 words
The closure structure as defined in claim 1 wherein said door frame includes a splash plate which extends into said base when said door frame is mounted into the base.
Claim 7
Dependent Claim
126 words
A portable and collapsible negative air control unit comprising: a base; at least one closure structure, said structure including a structure door frame having an inner peripheral edge and an outer periphery including at least one wall attaching means sealingly secured thereto around said periphery, said closure structure attaching means are zipper means and include an outer sealing flap over said zipper means, said door frame including means for mounting said structure door frame into said base; a door panel mounted to said frame, including a rectangular frame having an outer peripheral edge and a fabric covering sealingly secured to said rectangular frame and extending beyond said inner peripheral edge, to seal against said structure door frame; and a unit wall secured to said closure structure.
Claim 8
Dependent Claim
126 words
A portable and collapsible negative air control unit comprising: a base; at least one closure structure, said structure including a structure door frame having an inner peripheral edge and an outer periphery including at least one wall attaching means sealingly secured thereto around said periphery, said closure structure attaching means are zipper means and include an outer sealing flap over said zipper means, said door frame including means for mounting said structure door frame into said base; a door panel mounted to said frame, including a rectangular frame having an outer peripheral edge and a fabric covering sealingly secured to said rectangular frame and extending beyond said inner peripheral edge, to seal against said structure door frame; and a unit wall secured to said closure structure.
Claim 9
Dependent Claim
30 words
The unit as defined in claim 8 wherein said closure structure mounting means include a pair of pipes adapted to mount at one end thereof into bores in said base.
Claim 10
Dependent Claim
25 words
The unit as defined in claim 6 wherein said closure structure door outer peripheral edge is sized smaller than said door frame inner peripheral edge.
Claim 11
Dependent Claim
37 words
The unit as defined in claim 6 wherein said closure structure zipper means include a pair of zipper structures, forming a two sides zipper assembly both covered by said outer sealing flap to prevent air flow therethrough.
Claim 12
Dependent Claim
31 words
The unit as defined in claim 6 wherein said closure structure door frame includes a splash plate which extends into said base when said door frame is mounted into said base.
Claim 13
Dependent Claim
15 words
The unit as defined in claim 6 including at least a pair of closure structures.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |