US4618467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for sealing cavities
Assignee: Siemens AG
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Filing: 1984-11-29
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Granted: 1986-10-21
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Expires: 2004-11-29
Abstract
Abstract A method of sealing cavities open on one side, preferably cavities of electrical equipment housings fitted with various components. A measured quantity of an encapsulant, preferably polyurethane foam, is inserted into the cavity. Thereafter the opening is covered by a permeable, absorbent fabric, preferably of polypropylene, which is covered first by an elastic and then a rigid layer. After hardening, the fabric is removed from the surface of the encapsulant.
Inventors
- 👤 Hans-Joachim Burger
- 👤 Hubert Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:43
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/02; B29C39/10; B29C33/00; B29C33/42; B29C39/026; B29C44/00; B29C44/02; B29C44/12; B29C44/1266; B29C44/34; B29C44/58; B29C44/588; B29C70/00; B29C70/68; B29C70/70; B29K; B29K2075/00; B29L; B29L2031/00; B29L2031/34; B29L2031/3406
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
63 words
A method for sealing cavities having one open side and adapted to receive electrical or electronic components therein, comprising the steps of: disposing a measured quantity of encapsulant into the cavity: placing a layer of a releasable permeable absorbent synthetic resin fabric across said open side and overlapping the edge thereof: allowing the encapsulant to harden against said fabric; and removing said fabric.
Claim 2
Independent Claim
63 words
A method for sealing cavities having one open side and adapted to receive electrical or electronic components therein, comprising the steps of: disposing a measured quantity of encapsulant into the cavity: placing a layer of a releasable permeable absorbent synthetic resin fabric across said open side and overlapping the edge thereof: allowing the encapsulant to harden against said fabric; and removing said fabric.
Claim 3
Dependent Claim
32 words
The method according to claim 1, further including the steps of placing a layer of elastic material over said fabric; and thereafter placing a layer of rigid material over said elastic layer.
Claim 4
Dependent Claim
13 words
The method according to claim 1, in which said encapsulant comprises polyurethane foam.
Claim 5
Dependent Claim
14 words
The method according to claim 1, in which said encapsulant comprises a casting resin.
Claim 6
Dependent Claim
13 words
The method according to claim 1, wherein said fabric is formed of polypropylene.
Claim 7
Dependent Claim
13 words
The method according to claim 2, in which said encapsulant comprises polyurethane foam.
Claim 8
Dependent Claim
14 words
The method according to claim 2, in which said encapsulant comprises a casting resin.
Claim 9
Dependent Claim
13 words
The method according to claim 2, wherein said fabric is formed of polypropylene.
Claim 10
Independent Claim
63 words
A method for sealing cavities having one open side and electrical or electronic components mounted therein, comprising the steps of: disposing a measured quantity of polyurethane foam into the cavity; placing a layer of a releasable permeable absorbent synthetic resin fabric across said open side and overlapping the edge thereof; allowing the polyurethane foam to harden against said fabric; and removing said fabric.
Claim 11
Independent Claim
63 words
A method for sealing cavities having one open side and electrical or electronic components mounted therein, comprising the steps of: disposing a measured quantity of polyurethane foam into the cavity; placing a layer of a releasable permeable absorbent synthetic resin fabric across said open side and overlapping the edge thereof; allowing the polyurethane foam to harden against said fabric; and removing said fabric.
Claim 12
Dependent Claim
20 words
The method according to claim 9, wherein removing said fabric leaves a pattern on the surface of the polyurethane foam.
Claim 13
Dependent Claim
13 words
The method according to claim 9, wherein said fabric is formed of polypropylene.
Claim 14
Dependent Claim
32 words
The method according to claim 9, further including the steps of placing a layer of elastic material over said fabric; and thereafter placing a layer of rigid material over said elastic layer.
Claim 15
Dependent Claim
13 words
The method according to claim 12, wherein said fabric is formed of polypropylene.
Claim 16
Independent Claim
63 words
A method for sealing cavities having one open side and electrical or electronic components mounted therein, comprising the steps of: disposing a measured quantity of epoxy resin into the cavity; placing a layer of a releasable permeable absorbent synthetic resin fabric across said open side and overlapping the edge thereof; allowing the epoxy resin to harden against said fabric; and removing said fabric.
Claim 17
Independent Claim
63 words
A method for sealing cavities having one open side and electrical or electronic components mounted therein, comprising the steps of: disposing a measured quantity of epoxy resin into the cavity; placing a layer of a releasable permeable absorbent synthetic resin fabric across said open side and overlapping the edge thereof; allowing the epoxy resin to harden against said fabric; and removing said fabric.
Claim 18
Dependent Claim
20 words
The method according to claim 14, wherein removing said fabric leaves a pattern on the surface of the epoxy resin.
Claim 19
Dependent Claim
13 words
The method according to claim 14, wherein said fabric is formed of polypropylene.
Claim 20
Dependent Claim
32 words
The method according to claim 14, further including the steps of placing a layer of elastic material over said fabric; and thereafter placing a layer of rigid material over said elastic layer.
Claim 21
Dependent Claim
13 words
The method according to claim 17, wherein said fabric is formed of polypropylene.
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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) | 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 |