Patent US4618521A successfully refreshed from Google Patents.
US4618521A
Expired / Lapsed
US
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Corrosion protection sheet
Assignee: Ruetgerswerke AG
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Filing: 1985-01-18
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Granted: 1986-10-21
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Expires: 2005-01-18
Abstract
Abstract A corrosion protective sheet for adhesion to steel sheets which is made from elastomers and natural resin modified bitumen and which contains up to about 10% organic and or inorganic fibrous material. The sheet is coated on the underside with a melt adhesive and on the upper side with a bitumen resistant anti-block material which provides a solid sheet at a temperature under 90° C. No separation sheets are needed and the adherence of the sheet on the steel surface to be protected is improved and the upper surface is rendered resistant to penetration.
Inventors
- 👤 Karl Ruhl
- 👤 Karlheinz Bildner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:26
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31815; Y10T428/31844; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A corrosion protective sheet provided with perforations for the application by melting to steel surfaces at a temperature of 120° to 160° C. within 30 minutes which has a resistance to temperature in a range of -40° to 160° C. comprising a mixture of 60 to 90 weight percent bitumen, 0.5 to 7 weight percent SBR-rubber, 5 to 25 weight percent elastomeric modified bitumen, 0.5 to 7.5 weight percent natural resin and 0.5 to 10 weight percent of an organic or inorganic fibrous material which is resistant to a temperature of up to 160° C., and provided on the underside with a meltable adhesive (2) which exists as a solid sheet at a temperature under 90° C. and has a melting temperature between 120° and 160° C. and which is resistant to bitumen and having on the upper side a bitumen resistant anti-block material (3) which also is solid at a temperature under 90° C.
Claim 2
Dependent Claim
155 words
A corrosion protective sheet provided with perforations for the application by melting to steel surfaces at a temperature of 120° to 160° C. within 30 minutes which has a resistance to temperature in a range of -40° to 160° C. comprising a mixture of 60 to 90 weight percent bitumen, 0.5 to 7 weight percent SBR-rubber, 5 to 25 weight percent elastomeric modified bitumen, 0.5 to 7.5 weight percent natural resin and 0.5 to 10 weight percent of an organic or inorganic fibrous material which is resistant to a temperature of up to 160° C., and provided on the underside with a meltable adhesive (2) which exists as a solid sheet at a temperature under 90° C. and has a melting temperature between 120° and 160° C. and which is resistant to bitumen and having on the upper side a bitumen resistant anti-block material (3) which also is solid at a temperature under 90° C.
Claim 3
Dependent Claim
29 words
The corrosion protective sheet according to claim 1 further comprising said sheet having a density of 1000 to 1100 kg/m 3 and a thickness of 0.8 to 1.5 mm.
Claim 4
Dependent Claim
30 words
The corrosion protective sheet according to claim 2 further comprising wherein the perforations have a hole diameter of 0.5 to 3 mm and are spaced 5 to 50 mm apart.
Claim 5
Dependent Claim
30 words
The corrosion protective sheet according to claim 1 further comprising that the perforations have a dimension of 0.5 to 3 mm and are spaced from 5 to 50 mm apart.
Claim 6
Dependent Claim
19 words
The corrosion protective sheet in accordance with claim 1 further comprising said meltable adhesive sheet is a vinylchloride polymer.
Claim 7
Dependent Claim
20 words
The corrosion protective sheet in accordance with claim 1 further comprising said anti-block material being a sheet of vinylchloride polymer.
References Cited (Backward Citations)
US4282127A
Cited
US4473606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |