US3817540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Washers and gaskets
Assignee: Individual
•
Filing: 1972-04-17
•
Granted: 1974-06-18
•
Expires: 1992-04-17
Abstract
Abstract A washer or gasket consisting of two apertured layers of metal secured to one another, the upper layer being provided with one or more corrugations surrounding the or each aperture whereby the clamping load on a washer or gasket located between two mating surfaces is concentrated on said corrugations which seal their associated apertures. The lower layer is secured to the upper layer in such a manner as to assist the corrugations in their resistance to being flattened by the clamping load.
Inventors
- 👤 T Nicholson
- 👤 C Durham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:27
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/08; F16J15/0818; F16J15/0825; F16J2015/0837; F16J2015/085; F16J2015/0856; F16J2015/0875
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
Sealing means for location between a pair of opposed surfaces having at least one pair of aligned apertures, the means comprising two sheets of material which are in continuous close contact with one another except for an inverted channel section corrugation formed in one of said sheets around an aperture in both said sheets which is intended to align with said pair of aligned apertures, said two sheets being bonded together adjacent said inverted channel section in such a manner that flattening of the corrugations on application of compressive force thereto is resisted by virtue of the restraint imparted to the sheet having said corrugation by the other of said sheets through the bond therebetween.
Claim 2
Dependent Claim
115 words
Sealing means for location between a pair of opposed surfaces having at least one pair of aligned apertures, the means comprising two sheets of material which are in continuous close contact with one another except for an inverted channel section corrugation formed in one of said sheets around an aperture in both said sheets which is intended to align with said pair of aligned apertures, said two sheets being bonded together adjacent said inverted channel section in such a manner that flattening of the corrugations on application of compressive force thereto is resisted by virtue of the restraint imparted to the sheet having said corrugation by the other of said sheets through the bond therebetween.
Claim 3
Dependent Claim
37 words
Sealing means as claimed in claim 1 in which each layer defines a single aperture therethrough and in which the second layer is further secured to the first layer over a region remote from the aperture therethrough.
Claim 4
Dependent Claim
45 words
Sealing means as claimed in claim 2 in which a single upstanding corrugation is formed in the first layer to surround the aperture therethrough, the second layer being of annular form and secured to the first layer round both the inner and outer peripheries thereof.
Claim 5
Dependent Claim
17 words
Sealing means as claimed in claim 1 in which the two layers are secured together by welding.
Claim 6
Dependent Claim
17 words
Sealing means as claimed in claim 1 in which the two layers are secured together by brazing.
Claim 7
Dependent Claim
32 words
Sealing means as claimed in claim 1 and further comprising at least one nip control spacer adapted to seat on the outer regions of, to surround each aperture in, the first layer.
Claim 8
Dependent Claim
22 words
Sealing means as claimed in claim 6 in which the at least one nip control spacer is secured to the first layer.
Claim 9
Dependent Claim
23 words
Sealing means as claimed in claim 1 in which the layers are of metal, an outer protective coating being provided on said layers.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |