Patent US4789578A successfully refreshed from Google Patents.
US4789578A
Expired / Lapsed
US
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Protection membrane
Assignee: Premier Coatings Ltd
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Filing: 1987-05-14
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Granted: 1988-12-06
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Expires: 2007-05-14
Abstract
Abstract The invention relates to protective waterproof membranous sheeting which will prevent the passage of water and corrosive salt solutions into structures. The protection membrane comprises a bituminous adhesive waterproof sheet 1, a flexible polymeric protection grid 2 and a release sheet 3. The waterproof sheet 1 may comprise a fibre core in a matrix of a polymer modified bitumen polymer. The protection grid is partially embedded in the waterproof sheet 1, and is formed with drainage channels 13,14 on each face, provided by ribs or strands 4 and 5 defining the grid. The aperture size of the grid may be up to about 10 mm across. A filter web may be fixed to the face of the grid.
Inventors
- 👤 David R. Twyford
- 👤 Edward E. Hankins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B11/00; B32B11/10; B32B27/32; B32B27/36; B32B5/00; B32B5/02; B32B5/022; B32B5/024; B32B7/00; B32B7/04; B32B7/06; B32B7/12; E; E02; E02D; E02D31/00; E02D31/02; E04; E04C; E04C2/00; E04C2/44; E04C2/52; E04C2/526; E04C2/528; B32B2305/00; B32B2305/38; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/10; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/141; Y10T428/19; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24116; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24777; Y10T428/28; Y10T428/2835; Y10T428/2848; Y10T428/31504; Y10T428/31551; Y10T428/31641; Y10T428/31815; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A protection membrane comprising a bituminous adhensive waterproof sheet; a flexible polymeric protection grid adhered to an upper face of said sheet, a plurality of strands of polymeric material projecting from said upper face to define grid apertures, said strands extending transverse to each other so as to reinforce said waterproof sheet in two directions transverse to each other and to protect said waterproof sheet from puncturing due to impact, with at least some of said strands being at least partially embedded in said waterproof sheet.
Claim 2
Dependent Claim
86 words
A protection membrane comprising a bituminous adhensive waterproof sheet; a flexible polymeric protection grid adhered to an upper face of said sheet, a plurality of strands of polymeric material projecting from said upper face to define grid apertures, said strands extending transverse to each other so as to reinforce said waterproof sheet in two directions transverse to each other and to protect said waterproof sheet from puncturing due to impact, with at least some of said strands being at least partially embedded in said waterproof sheet.
Claim 3
Dependent Claim
23 words
A protection membrane as claimed in claim 1 wherein said apertures formed in said grid are not greater than about 10 mm across.
Claim 4
Dependent Claim
20 words
A protection membrane as claimed in claim 1 wherein said apertures formed in said grid are about 5 mm across.
Claim 5
Dependent Claim
80 words
A protection membrane as claimed in claim 1 wherein said grid is formed from two sets of parallel strands, each set extending transversely of the other and wherein a lower set is partially embedded in said waterproof sheet and an upper set of strands runs across said lower set, thereby forming a first set of continuous open channels between said upper set and a second set of channels between said lower set of strands which run beneath said upper set.
Claim 6
Dependent Claim
23 words
A protection membrane as claimed in claim 1 wherein said waterproof sheet comprises a fibre or sheet core in a flexible water-impervious matrix.
Claim 7
Dependent Claim
21 words
A protection membrane as claimed in claim 5 wherein said fibre or sheet core is made of polyester, glass or polypropylene.
Claim 8
Dependent Claim
17 words
A protection membrane as claimed in claim 5 wherein said water-impervious matrix is a polymer modified bitumen.
Claim 9
Dependent Claim
16 words
A protection membrane according to claim 1 wherein said water-impervious matrix is a polymer modified bitumen.
Claim 10
Dependent Claim
32 words
A protection membrane as claimed in claim 1 wherein one edge of said membrane is left uncovered by said grid for facilitating lap joining, and is protected by a release coated sheet.
Claim 11
Dependent Claim
36 words
A protection membrane as claimed in claim 1 wherein an additional coating of polymer modified bitumen is applied to one edge of said grid for facilitating lap joining and is protected by a release coated sheet.
Claim 12
Dependent Claim
17 words
A protection membrane as claimed in claim 1 wherein a filter web is fixed onto the grid.
Claim 13
Dependent Claim
23 words
A protection membrane according to claim 1 wherein a release sheet is adhered to the face of the membrane remote from said grid.
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |