Patent US3971223A successfully refreshed from Google Patents.
US3971223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection method
Assignee: BP PLC
•
Filing: 1974-12-04
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Granted: 1976-07-27
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Expires: 1994-12-04
Abstract
Abstract Ground surfaces are rendered impervious by first covering the ground with netting and then spraying glass fiber and polyester resin on the netting and allowing it to cure.
Inventors
- 👤 Joseph Edward Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:24
CPC Classifications
E; E02; E02D; E02D31/00; E02D31/002; E02D31/004; C; C09; C09K; C09K17/00; Y; Y10; Y10S; Y10S264/00; Y10S264/81
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A method for forming a glass fiber reinforced unsaturated polyester resin (GRP) sheet on a ground surface which comprises covering the surface with a membrane which is sufficiently flexible to conform to the contours of the ground surface under the force of the sprayed glass fibers and resin, arranging a flexible sheet mesh structure on the membrane, said structure having a thickness less than the desired thickness of the GRP sheet but of sufficient thickness to prevent drainage of said polyester resin from a sloping ground surface, and applying glass fibers and unsaturated polyester resin onto the membrane/mesh structure to the desired thickness using the thickness, color and visual appearance of said mesh structure to gauge the thickness of said GRP sheet.
Claim 2
Independent Claim
122 words
A method for forming a glass fiber reinforced unsaturated polyester resin (GRP) sheet on a ground surface which comprises covering the surface with a membrane which is sufficiently flexible to conform to the contours of the ground surface under the force of the sprayed glass fibers and resin, arranging a flexible sheet mesh structure on the membrane, said structure having a thickness less than the desired thickness of the GRP sheet but of sufficient thickness to prevent drainage of said polyester resin from a sloping ground surface, and applying glass fibers and unsaturated polyester resin onto the membrane/mesh structure to the desired thickness using the thickness, color and visual appearance of said mesh structure to gauge the thickness of said GRP sheet.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein the unsaturated polyester resin contains carbon black.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1 wherein the sheet mesh structure has a mesh size of from a 1/2 to 11/2 inches.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1 wherein the holes in the sheet mesh structure take up at least 75% of the area of the whole sheet.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 1 wherein the sheet mesh structure is filament netting.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1 wherein the glass fibre reinforcement is in the form of chopped rovings.
Claim 8
Dependent Claim
17 words
A method as claimed in claim 1 wherein the membrane is polyethylene sheet or polyvinyl acetate sheet.
Claim 9
Dependent Claim
25 words
A method as claimed in claim 1 wherein the sheet mesh structure is attached to the membrane before it is laid on the ground surface.
Claim 10
Dependent Claim
36 words
A method as claimed in claim 1 wherein the sheet mesh structure has a thickness less than the desired thickness of the GRP sheet formed by curing the glass fibre reinforcement and the unsaturated polyester resin.
Claim 11
Dependent Claim
14 words
A method as claimed in claim 1 when applied to a sloping ground surface.
Claim 12
Dependent Claim
19 words
A method as claimed in claim 1 wherein the sheet mesh structure and/or the unsaturated polyester resin is pigmented.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |