US4732633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of patching damaged sheet material
Assignee: 3M Co
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Filing: 1986-08-01
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Granted: 1988-03-22
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Expires: 2006-08-01
Abstract
Abstract Method for repairing damaged metal surfaces comprising the steps of: (1) exposing bare metal surface in the vicinity surrounding the damaged area to be repaired, (2) cleaning the bare metal surface, (3) providing a thin, corrosion-resistant patch consisting of a covering member having a face side, back side, and edge side bounded by said face side and said back side, and having a layer of adhesive, preferably a pressure-sensitive adhesive, and coated on said back side, and (4) applying the corrosion-resistant patch to the damaged surface, said patch adhering to the bare metal surface adjoining and surrounding the patch, and (5) applying a sufficient amount of flexible putty to the bare metal surface adjoining and surrounding the patch so that a smooth transition running from the face side of said covering member to the metal surface is obtained. This method does not require the use of two-component body fillers, thus simplifying sheet metal repair for the novice.
Inventors
- 👤 Richard J. Pokorny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
B; B29; B29C; B29C73/00; B29C73/04; B29C73/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49732; Y10T428/00; Y10T428/20; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/24967; Y10T428/28; Y10T428/2804
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
199 words
Method for repairing a damaged area in the surface of a body made of metal comprising the steps of: (1) exposing bare metal surface in the vicinity surrounding the damaged area to be repaired, (2) cleaning the bare metal surface, (3) providing a thin, corrosion-resistant patch consisting of a covering member having a face side, a back side, and an edge side bounded by the face side and the back side, said back side having a layer of adhesive coated thereon, said covering member having a thickness of from about 0.13 to about 0.46 mm, said layer of adhesive having a thickness of from about 0.05 to about 0.38 mm, said adhesive having a peel strength of at least 7 lb./in., (4) applying said patch to the damaged surface, said back side of said patch being in contact with and adhering to the bare metal surface adjoining and surrounding the patch by means of said adhesive, and (5) applying flexible putty to the bare metal surface adjoining and surrounding the patch and abutting the edge side of the patch in an amount sufficient to obtain a smooth transition from the face side of the patch to the metal surface.
Claim 2
Dependent Claim
199 words
Method for repairing a damaged area in the surface of a body made of metal comprising the steps of: (1) exposing bare metal surface in the vicinity surrounding the damaged area to be repaired, (2) cleaning the bare metal surface, (3) providing a thin, corrosion-resistant patch consisting of a covering member having a face side, a back side, and an edge side bounded by the face side and the back side, said back side having a layer of adhesive coated thereon, said covering member having a thickness of from about 0.13 to about 0.46 mm, said layer of adhesive having a thickness of from about 0.05 to about 0.38 mm, said adhesive having a peel strength of at least 7 lb./in., (4) applying said patch to the damaged surface, said back side of said patch being in contact with and adhering to the bare metal surface adjoining and surrounding the patch by means of said adhesive, and (5) applying flexible putty to the bare metal surface adjoining and surrounding the patch and abutting the edge side of the patch in an amount sufficient to obtain a smooth transition from the face side of the patch to the metal surface.
Claim 3
Dependent Claim
26 words
Method according to claim 1 further including the step of abrading said putty after it has dried to provide a feather edge in the damaged area.
Claim 4
Dependent Claim
18 words
Method according to claim 2 further including the step of applying primer coat to the repaired damaged area.
Claim 5
Dependent Claim
16 words
Method according to claim 3 further including the step of painting the primed repaired damaged area.
Claim 6
Dependent Claim
18 words
Method according to claim 1 further including the step of applying primer coat to the repaired damaged area.
Claim 7
Dependent Claim
16 words
Method according to claim 5 further including the step of painting the primed repaired damaged area.
Claim 8
Dependent Claim
19 words
Method according to claim 1 wherein the covering member of said patch is made of a tempered aluminum alloy.
Claim 9
Dependent Claim
12 words
Method according to claim 1 wherein said adhesive is a pressure-sensitive adhesive.
Claim 10
Dependent Claim
39 words
Method according to claim 1 wherein said cured putty is capable of bending around at least a 50 mm mandrel when applied at 0.10 mm thickness at 22° C. without cracking when tested in accordance with ASTM D 1737(62).
Claim 11
Dependent Claim
28 words
Method according to claim 1 further including the step of straightening or bending the body to the proper contour prior to applying said patch to the damaged area.
References Cited (Backward Citations)
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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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |