Patent US4020874A successfully refreshed from Google Patents.
US4020874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic thread protector for internally threaded pipe
Assignee: Precise Metals and Plastics Inc
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Filing: 1975-09-05
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Granted: 1977-05-03
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Expires: 1995-09-05
Abstract
Abstract A thermoplastic thread protector is provided for use in protecting internal threads of a pipe or coupling, the protector comprising a tapered shell having threads thereon and an outer flange which rest on the end of the pipe, and a tapered expansion ring designed to expand the shell into locking contact with the pipe, the shell and ring being interlocked through a rim around one end of the ring and a lip around the other end so that the protector must be unscrewed as a unit from the pipe.
Inventors
- 👤 Ronald H. Palarino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:59
CPC Classifications
F; F16; F16L; F16L57/00; F16L57/005; B; B65; B65D; B65D59/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A thermoplastic thread protector for the inner threads of a pipe or coupling, comprising: a frusto-conically shaped shell having threads on the outer wall thereof, the length of the shell sufficient to cover the threaded portion of the pipe, said shell terminating at the wide end thereof as a flange extending away from the longitudinal axis of the shell, the flange having spaced outwardly and axially extending projections; and a frusto-conically shaped expansion ring having an outwardly extending rim around the wide end thereof and an outwardly directed lip around the other end, the ring being of such a dimension that when inserted into the shell, with the shell placed in the pipe and the flange thereof resting on the end of the pipe, the shell is expanded to lock the threads thereof with the pipe threads and concentrically mate the ring and shell, with the ends of the shell contiguous with and locked between the rim and lip of said ring.
Claim 2
Dependent Claim
162 words
A thermoplastic thread protector for the inner threads of a pipe or coupling, comprising: a frusto-conically shaped shell having threads on the outer wall thereof, the length of the shell sufficient to cover the threaded portion of the pipe, said shell terminating at the wide end thereof as a flange extending away from the longitudinal axis of the shell, the flange having spaced outwardly and axially extending projections; and a frusto-conically shaped expansion ring having an outwardly extending rim around the wide end thereof and an outwardly directed lip around the other end, the ring being of such a dimension that when inserted into the shell, with the shell placed in the pipe and the flange thereof resting on the end of the pipe, the shell is expanded to lock the threads thereof with the pipe threads and concentrically mate the ring and shell, with the ends of the shell contiguous with and locked between the rim and lip of said ring.
Claim 3
Dependent Claim
30 words
The thermoplastic thread protector defined in claim 1 wherein the outwardly extending rim on the expansion ring covers the flange of the shell with said projections extending radially outwardly therefrom.
Claim 4
Dependent Claim
20 words
The thermoplastic thread protector defined in claim 1 wherein the threads on the shell extend only along a portion thereof.
Claim 5
Dependent Claim
20 words
The thermoplastic thread protector defined in claim 3 wherein said portion is spaced from the wide end of the shell.
Claim 6
Dependent Claim
38 words
The thermoplastic thread protector defined in claim 4 wherein the taper of the shell is more severe between the threads and the wide end of the shell than between the threads and the opposite end of the shell.
Claim 7
Dependent Claim
22 words
The thermoplastic thread protector defined in claim 5 wherein the taper of said expansion ring corresponds to the taper of said shell.
References Cited (Backward Citations)
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Cited
US2022189A
Cited
US2121436A
Cited
US2893437A
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US3056427A
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US3073470A
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US3578200A
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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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |