US3918748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branch connection for thermoplastic pipe
Assignee: Renolit Nederland BV
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Filing: 1974-09-12
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Granted: 1975-11-11
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Expires: 1994-09-12
Abstract
Abstract A branch connection for clamping to pipes of thermoplastic synthetic resin. The connection has an insert of synthetic resin which is connected to the main pipe by means of welding.
Inventors
- 👤 Petrus Marinus Acda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:03
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/008; F16L47/00; F16L47/02; F16L47/03; F16L47/26; F16L47/34; F16L47/345
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
A branch connection for connecting a branch pipe to a main pipe made of a thermoplastic material, comprising a cylindrical tubular insert made of a thermoplastic material and having an end adapted for welding to the main pipe; a shell-shaped member arranged to fit about the insert and a portion of the main pipe; means for clamping the member to the main pipe; a branching member; means for connecting a branch pipe to the branching member; means for connecting the branching member to the shellshaped member; and a sealing ring having an uncompressed annular thickness; wherein said insert has an inner cylindrical surface, and said branching member comprises a portion extending within said insert and having a radial clearance between the extending portion and the inner surface of the insert less than the uncompressed annular thickness of the sealing ring, the sealing ring being compressed between said extending portion and said inner surface.
Claim 2
Dependent Claim
153 words
A branch connection for connecting a branch pipe to a main pipe made of a thermoplastic material, comprising a cylindrical tubular insert made of a thermoplastic material and having an end adapted for welding to the main pipe; a shell-shaped member arranged to fit about the insert and a portion of the main pipe; means for clamping the member to the main pipe; a branching member; means for connecting a branch pipe to the branching member; means for connecting the branching member to the shellshaped member; and a sealing ring having an uncompressed annular thickness; wherein said insert has an inner cylindrical surface, and said branching member comprises a portion extending within said insert and having a radial clearance between the extending portion and the inner surface of the insert less than the uncompressed annular thickness of the sealing ring, the sealing ring being compressed between said extending portion and said inner surface.
Claim 3
Dependent Claim
36 words
A connection as claimed in claim 1 wherein said shell-shaped member is arranged to fit snugly about the outer cylindrical surface of the insert, whereby deformation of the insert by the sealing ring pressure is prevented.
Claim 4
Dependent Claim
21 words
A connection as claimed in claim 2 wherein said insert member consists of the same thermoplastic material as the main pipe.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |