Patent US1309222A successfully refreshed from Google Patents.
US3847722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated materials for leak prevention
Assignee: 3M Co
•
Filing: 1972-01-27
•
Granted: 1974-11-12
•
Expires: 1992-01-27
Abstract
Abstract A permeable, deformable substrate impregnated with an isocyanatterminated, hydrophilic urethane prepolymer is used to stop water leaks in small holes or crevices by positioning the impregnated material therein, the prepolymer reacting with water to form a swollen, adherent, waterinsoluble hydrogel.
Inventors
- 👤 J Kistner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0037; B32; B32B; B32B27/00; B32B27/12; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C09; C09K; C09K3/00; C09K3/10; C09K3/1006; C09K3/1021; D; D06; D06M; D06M17/00; D06M17/04; D06M17/10; E; E02; E02D; E02D37/00; B29K; B29K2075/00; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; B29K2105/16; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2307/00; B32B2307/70; B32B2307/728; B32B2325/00; B32B2375/00; C08G2210/00; C09K2200/00; C09K2200/02; C09K2200/0243; Y; Y10; Y10S; Y10S528/00; Y10S528/904; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24231; Y10T428/2424; Y10T428/24248; Y10T428/31504; Y10T428/31551; Y10T428/31598
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
A DEFORMABLE, PERMEABLE SUBSTRATE COMPRISING EXPANDED VERMICULITE ENCLOSED IN A NON-WOVEN WEB ENVELOPE, SAID VERMICULITE BEING IMPREGNATED WITH A HYDROPHILIC PREPOLYMER, SAID PREPOLYMER BEING A WATER-MISCIBLE ISOCYANATE-TERMINATED PREPOLYMER HAVING A PLURALITY OF OXYETHYLENE UNITS AND THE FORMULA:
Claim 2
Dependent Claim
37 words
A DEFORMABLE, PERMEABLE SUBSTRATE COMPRISING EXPANDED VERMICULITE ENCLOSED IN A NON-WOVEN WEB ENVELOPE, SAID VERMICULITE BEING IMPREGNATED WITH A HYDROPHILIC PREPOLYMER, SAID PREPOLYMER BEING A WATER-MISCIBLE ISOCYANATE-TERMINATED PREPOLYMER HAVING A PLURALITY OF OXYETHYLENE UNITS AND THE FORMULA:
Claim 3
Dependent Claim
23 words
The substrate according to claim 1 where the impregnated vermiculite enclosed in the non-woven web envelope is enclosed in a rupturable water-impermeable envelope.
Claim 4
Dependent Claim
138 words
A structure normally having discontinuities therein susceptible to leakage, said discontinuities being sealed by an impregnated permeable deformable substrate comprising expanded vermiculite enclosed in a non-woven web envelope, said vermiculite containing a hydrophilic polyurethane prepolymer which is cured and polymerized in situ in the presence of water to form a hydrophilic, water-insoluble poly(urethane-urea) forming a water impermeable barrier in said discontinuities, said prepolymer having the formula: Y1-((CH2CH2O)0 -CONH-R-(NCO)p)z where Y1 is an active hydrogen-free residue of a polyhydroxyalkane, (CH2CH2O)0 is a hydrophilic polyoxyethylene chain, 0 is the number of oxyethylene units in said chain, 0 being from about 15 to 50, R is an aromatic nucleus, p is an integer equal to q-1, where q is the number of isocyanate moieties of a polyisocyanate precursor, and z is a number equal to the hydroxyl functionality of said polyhydroxyalkane.
Claim 5
Dependent Claim
138 words
A structure normally having discontinuities therein susceptible to leakage, said discontinuities being sealed by an impregnated permeable deformable substrate comprising expanded vermiculite enclosed in a non-woven web envelope, said vermiculite containing a hydrophilic polyurethane prepolymer which is cured and polymerized in situ in the presence of water to form a hydrophilic, water-insoluble poly(urethane-urea) forming a water impermeable barrier in said discontinuities, said prepolymer having the formula: Y1-((CH2CH2O)0 -CONH-R-(NCO)p)z where Y1 is an active hydrogen-free residue of a polyhydroxyalkane, (CH2CH2O)0 is a hydrophilic polyoxyethylene chain, 0 is the number of oxyethylene units in said chain, 0 being from about 15 to 50, R is an aromatic nucleus, p is an integer equal to q-1, where q is the number of isocyanate moieties of a polyisocyanate precursor, and z is a number equal to the hydroxyl functionality of said polyhydroxyalkane.
References Cited (Backward Citations)
US2948691A
Cited
US2867278A
Cited
GB1013376A
Cited
US3193438A
Cited
US3284273A
Cited
US3546846A
Cited
US3536564A
Cited
US3694301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |