Patent AT383260B successfully refreshed from Google Patents.
Patent US4584233A successfully refreshed from Google Patents.
US4584233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patch for urethane-based membrane and method
Assignee: Chevron USA Inc
•
Filing: 1983-12-12
•
Granted: 1986-04-22
•
Expires: 2003-12-12
Abstract
Abstract A patch for the underwater patching of a urethane-based coating membrane is provided. The patch comprises a section of nonwoven, fabric-reinforced urethane-based membrane coated with a composition comprising a polyurethane; non-volatile extender; a volatile solvent; and a water-insoluble, heavier-than-water, inert filler material dense enough to make the composition denser than water. Methods for effecting the patching or repair using the patch are also provided.
Inventors
- 👤 Arthur L. Meader, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:03
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; B; B29; B29C; B29C73/00; B29C73/04; B29C73/10; C; C08; C08K; C08K5/00; C08K5/01; C08L; C08L75/00; C08L75/04; C08L95/00; C09; C09D; C09D175/00; C09D175/04; B29K; B29K2075/00; B29K2095/00; B29K2105/00; B29K2105/0002; B29K2105/06; B29K2105/08; B29K2105/0854; B29K2105/16; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B29L; B29L2031/00; B29L2031/712; B29L2031/755; Y; Y10; Y10T; Y10T428/00; Y10T428/20; Y10T428/26; Y10T428/31504; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/2738; Y10T442/2754
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A patch for patching a urethane-based coating membrane comprising a section of nonwoven, fabric-reinforced, urethane-based membrane, said membrane section being coated with sufficient patching composition to permit said patch to adhere in a water-tight manner to said urethane-based coating membrane, said patching composition comprising: (a) 25 to 75 parts by weight of polyurethane formed by reacting 20 to 55 parts by weight of a polyurethane precursor with 6 to 20 parts by weight of a polyisocyanate; (b) 25 to 75 parts by weight of a substantially inert, nonvolatile extender selected from the group of cutback asphalts and extender oils; (c) a volatile solvent; and (d) 20 to 50 parts by weight of a water-insoluble, heavier-than-water filler material sufficiently dense to make the composition denser than the density of water.
Claim 2
Dependent Claim
129 words
A patch for patching a urethane-based coating membrane comprising a section of nonwoven, fabric-reinforced, urethane-based membrane, said membrane section being coated with sufficient patching composition to permit said patch to adhere in a water-tight manner to said urethane-based coating membrane, said patching composition comprising: (a) 25 to 75 parts by weight of polyurethane formed by reacting 20 to 55 parts by weight of a polyurethane precursor with 6 to 20 parts by weight of a polyisocyanate; (b) 25 to 75 parts by weight of a substantially inert, nonvolatile extender selected from the group of cutback asphalts and extender oils; (c) a volatile solvent; and (d) 20 to 50 parts by weight of a water-insoluble, heavier-than-water filler material sufficiently dense to make the composition denser than the density of water.
Claim 3
Dependent Claim
75 words
The patch as claimed in claim 1, wherein the patching composition comprises 30 to 50 parts by weight of said polyurethane formed by reacting 35 to 50 parts by weight of said polyurethane precursor with 5 to 10 parts by weight of said polyisocyanate; 35 to 50 parts by weight of said non-volatile extender; up to 20 parts by weight of said volatile solvent; and 20 to 30 parts by weight of said heavier-than-water filler.
Claim 4
Dependent Claim
17 words
The patch as claimed in claim 1, wherein said heavier-than-water filler is an inert, inorganic, finely-ground material.
Claim 5
Dependent Claim
24 words
The patch as claimed in claim 3, in which said heavier-than-water filler is selected from hydrated alumina, ground limestone, ground silica, and calcium carbonate.
Claim 6
Dependent Claim
54 words
The patch as claimed in claim 2, wherein said polyisocyanate is reacted with said polyurethane precursor in a mole ratio of 1.0 to 1.4:1, said polyurethane precursor comprising 30 to 55 parts by weight of a high molecular weight polyol and 4 to 8 parts by weight of a low molecular weight chain stiffener.
Claim 7
Dependent Claim
27 words
A patch as claimed in claim 1, in which said composition is coated on said fabric-reinforced membrane section in a thickness of from one-sixteenth to one-half inch.
Claim 8
Dependent Claim
49 words
A method for repairing a urethane-based coating membrane comprising applying a patch as claimed in claim 1 or 2 of sufficient area to cover the hole or tear in said membrane, over said hole or tear and permitting said patching composition to set and provide a secure, water-tight seal.
Claim 9
Dependent Claim
17 words
The repair method as claimed in claim 7, in which said repair is carried out under water.
Claim 10
Dependent Claim
70 words
A method for repairing a water-submerged, urethane-based membrane comprising forming a patch as claimed in claim 1 or 2 of sufficient area to effect said repair; positioning said patch on the surface of the water above the area to be repaired; permitting said patch to sink to said membrane coating while guiding it to the desired position; and allowing the patching composition to set and provide a secure, water-tight seal.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |