US4330581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing element
Assignee: Braas GmbH
•
Filing: 1979-11-05
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Granted: 1982-05-18
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Expires: 1999-11-05
Abstract
Abstract A sealing element is provided which is suitable for sealing flat roofs and engineering structures. The sealing element is made of a water-resistant elastomer or plastomer, and comprises a lamelliform structure of substantially circular shape having from four to six waves, inclusively, distributed radially throughout the structure and around the entire circumference of the structure, the amplitudes of which waves increase regularly from the center of the structure towards the circumference. The undulations enable the sealing element to have an effective surface covering more than 360° without straining any region of the element.
Inventors
- 👤 Bernhard Borgert
- 👤 Udo Liche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:03
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/14; E04D13/1407; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/215; Y10T428/24; Y10T428/24628
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A sealing element made of a water-resistant elastomer or plastomer for outer corners on flat roofs and similar engineering constructions, which comprises a lamelliform structure of substantially circular shape having inclusively from four to six waves distributed radially throughout the structure and around the entire circumference of the structure, the amplitudes of which waves increase regularly from the centre of the structure towards the circumference.
Claim 2
Dependent Claim
65 words
A sealing element made of a water-resistant elastomer or plastomer for outer corners on flat roofs and similar engineering constructions, which comprises a lamelliform structure of substantially circular shape having inclusively from four to six waves distributed radially throughout the structure and around the entire circumference of the structure, the amplitudes of which waves increase regularly from the centre of the structure towards the circumference.
Claim 3
Dependent Claim
24 words
A sealing element as claimed in claim 1, wherein there are five waves of equal size distributed uniformly around the circumference of the structure.
Claim 4
Dependent Claim
59 words
A sealing element as claimed in claim 1, wherein the waves are such that the sealing element can be stretched to form a flat base in the form of a reflex sector of a circle from which there extends, out of the plane of the circle, a portion of the sealing element in the form of two adjoining quadrants.
Claim 5
Dependent Claim
17 words
A sealing element as claimed in claim 1, which is manufactured from soft PVC or a polyisobutylene.
Claim 6
Dependent Claim
21 words
A sealing element as claimed in any preceding claim, wherein the sealing element has a diameter of 150 to 300 mm.
Claim 7
Dependent Claim
44 words
A sealing element as claimed in claim 1, wherein the amplitude of the waves, at the circumference of the structure, is about D/10, and their radius of curvature, at the circumference of the structure, is about D/5, where D=the diameter of the sealing element.
Claim 8
Dependent Claim
46 words
A sealing element as claimed in claim 6, which has a diameter of about 210 mm and in which there are five waves which, at the circumference of the structure, have an amplitude of about 21 mm and a radius of curvature of about 43 mm.
Claim 9
Dependent Claim
70 words
A sealing element for corners on flat roofs and similar engineering constructions, which is made of water-resistant soft PVC or a polyisobutylene, and which comprises a lamelliform structure of substantially circular shape having inclusively from four to six waves distributed radially throughout the structure which waves extend around the entire circumference to the structure, the amplitude of the waves increasing linearly from the centre of the structure towards the circumference.
Claim 10
Dependent Claim
70 words
A sealing element for corners on flat roofs and similar engineering constructions, which is made of water-resistant soft PVC or a polyisobutylene, and which comprises a lamelliform structure of substantially circular shape having inclusively from four to six waves distributed radially throughout the structure which waves extend around the entire circumference to the structure, the amplitude of the waves increasing linearly from the centre of the structure towards the circumference.
Claim 11
Dependent Claim
44 words
A sealing element as claimed in claim 8, wherein the amplitude of the waves, at the circumference of the structure, is about D/10, and their radius of curvature, at the circumference of the structure, is about D/5, where D=the diameter of the sealing element.
References Cited (Backward Citations)
CA736647A
Cited
US1640987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |