US4165397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repair of glass laminates
Assignee: 3M Co
•
Filing: 1975-09-15
•
Granted: 1979-08-21
•
Expires: 1995-09-15
Abstract
Abstract Repair of bulls-eye mark damage to laminated glass is effected by subjecting the area of the crack to reduced air pressure of at most 0.5 mm Hg for 10 minutes, application of a low viscosity, liquid, curable composition, increase in the air pressure, and cure of the resin composition to a transparent polymer.
Inventors
- 👤 P. H. Ogden
- 👤 H. Pennicott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:54
CPC Classifications
B; B29; B29C; B29C73/00; B29C73/02; B29C73/025; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10963; C; C03; C03C; C03C27/00; C03C27/06; C03C27/10; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/226; B29L; B29L2031/00; B29L2031/30; B29L2031/3052; B29L2031/778; Y; Y10; Y10T; Y10T428/00; Y10T428/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
A method of repairing crack damage to a glass laminate which comprises subjecting the region of the laminate surface containing the crack to a reduced pressure of no greater than 0.5 mm Hg for at least 10 minutes to remove air from the crack, applying a low viscosity, liquid, curable resin composition to the laminate surface over the crack, removing the reduced pressure and curing the curable resin composition to a transparent polymer whose refractive index is sufficiently close to that of the glass to give a visibly non-obvious repair.
Claim 2
Independent Claim
90 words
A method of repairing crack damage to a glass laminate which comprises subjecting the region of the laminate surface containing the crack to a reduced pressure of no greater than 0.5 mm Hg for at least 10 minutes to remove air from the crack, applying a low viscosity, liquid, curable resin composition to the laminate surface over the crack, removing the reduced pressure and curing the curable resin composition to a transparent polymer whose refractive index is sufficiently close to that of the glass to give a visibly non-obvious repair.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 in which the curable resin composition comprises a blend of at least two curable monomers and/or pre-polymers.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1 which includes at least one curable epoxide and a curing agent therefore.
Claim 5
Dependent Claim
43 words
A method as claimed in claim 1 in which the curable resin composition applied to the laminate surface includes a volatile solvent in an amount insufficient to leave visible voids in the repair after evaporation of the solvent and curing of the composition.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 1 in which at least one component in the curable resin composition has an active silane group.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1 in which the reduced pressure is applied for at least 30 minutes.
Claim 8
Dependent Claim
69 words
A method as claimed in claim 1 in which an open-topped reservoir is formed over the region of the laminate surface containing the crack by sticking an open-topped pocketshaped member to the surface of the laminate, the resin composition being added to this reservoir after application of the reduced pressure, and the pocket-shaped member being removed from the surface of the laminate after the removal of the reduced pressure.
Claim 9
Dependent Claim
13 words
A method as claimed in claim 1 wherein excess cured resin is removed.
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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |