Patent US4455804A successfully refreshed from Google Patents.
US4455804A
Expired / Lapsed
US
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Membrane anchor
Assignee: SINGLE-PLY INSTITUTE Inc A CORP F MD
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Filing: 1982-02-19
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Granted: 1984-06-26
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Expires: 2002-02-19
Abstract
Abstract A membrane anchor comprises a disc of rubber-like material having a central opening and downwardly inclined upper and lower surfaces. The lower surface has grooves for receiving mastic.
Inventors
- 👤 Thomas F. Francovitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:33
CPC Classifications
E; E04; E04D; E04D5/00; E04D5/14; E04D5/141; E04D5/143; E04D5/144; E04D5/145
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
95 words
A membrane anchor comprising a resilient, water-impervious disc of rubber-like material having upper and lower surfaces, an axial opening at the center of said disc, said disc having a central region of substantially uniform thickness and a peripheral region of tapering thickness adjacent to and outwardly of said central region, said peripheral region being of substantially the same thickness as said central region at the juncture of said regions, said lower surface of said disc at said central region being substantially planar and having continuous groove means therein about said opening for receiving sealing material.
Claim 2
Dependent Claim
95 words
A membrane anchor comprising a resilient, water-impervious disc of rubber-like material having upper and lower surfaces, an axial opening at the center of said disc, said disc having a central region of substantially uniform thickness and a peripheral region of tapering thickness adjacent to and outwardly of said central region, said peripheral region being of substantially the same thickness as said central region at the juncture of said regions, said lower surface of said disc at said central region being substantially planar and having continuous groove means therein about said opening for receiving sealing material.
Claim 3
Dependent Claim
19 words
The membrane anchor of claim 1, and a recess in the upper surface of said disc surrounding said opening.
Claim 4
Dependent Claim
21 words
The membrane anchor of claim 1 or 2, and a recess in the lower surface of said disc surrounding said opening.
Claim 5
Dependent Claim
14 words
The membrane anchor of claim 1, said peripheral region being of outwardly tapering thickness.
Claim 6
Dependent Claim
23 words
The membrane anchor of claim 4, wherein the upper surface of the outer region is inclined downwardly towards the edge of the disc.
Claim 7
Dependent Claim
25 words
The membrane anchor of claim 1 wherein the lower surface is inclined upwardly from the edge of the disc when the disc is not stressed.
Claim 8
Dependent Claim
23 words
The membrane anchor of claim 6, wherein the lower surface is inclined upwardly from the disc edge to the juncture of said regions.
Claim 9
Dependent Claim
21 words
The membrane anchor of claim 1, and a linear fastener extending through said opening and having a head engaging said disc.
Claim 10
Dependent Claim
25 words
The structure of claim 8, said disc having a recess in the upper surface surrounding said opening, and said fastener head located in said recess.
Claim 11
Dependent Claim
11 words
The structure of claim 9, and means for sealing said opening.
Claim 12
Dependent Claim
23 words
The structure of claim 10, said sealing means comprising a mass of sealing material engaging said head and adjacent parts of said disc.
Claim 13
Dependent Claim
28 words
The structure of claim 8, a membrane engaged by substantially the entire disc lower surface, and means for preventing penetration of moisture to the center of said disc.
Claim 14
Dependent Claim
20 words
The structure of claim 12, last said mentioned means comprising sealing material in said groove means and engaging said membrane.
Claim 15
Dependent Claim
25 words
The membrane anchor of claim 4, wherein the lower surface is inclined upwardly from the edge of the disc when the disc is not stressed.
Claim 16
Dependent Claim
23 words
The membrane anchor of claim 1, wherein the lower surface is inclined upwardly from the disc edge to the juncture of said regions.
Claim 17
Dependent Claim
28 words
The structure of claim 11, a membrane engaged by substantially the entire disc lower surface, and means for preventing penetration of moisture to the center of said disc.
Claim 18
Dependent Claim
20 words
The structure of claim 16, said last mentioned means comprising sealing material in said groove means and engaging said membrane.
Claim 19
Dependent Claim
17 words
The structure of claim 17, said disc being secured to said membrane only by said linear fastener.
Claim 20
Dependent Claim
28 words
The structure of claim 9, a membrane engaged by substantially the entire disc lower surface, and means for preventing penetration of moisture to the center of said disc.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |