US3269581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe stopper plug
Assignee: JOINTS Inc
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Filing: 1965-04-05
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Granted: 1966-08-30
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Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 William G Calder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:26
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/11; F16L55/1141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A SELF-ALIGNING, SELF-CENTERING, PRESSURE RESISTANT STOPPER PLUG READILY INSERTABLE INTO AND REMOVABLE FROM THE OPEN END OF A PIPE, COMPRISING: A CYLINDRICAL PLUG OF RESILIENT MATERIAL, SAID PLUG HAVING A CIRCULAR INTERNAL VIRTUALLY PLANAR PRESSURE RECEPTIVE FRONT FACE, A REAR FACE INCLUDING A CENTRAL RECESSED PORTION, THE DIAMETER OF SAID REAR FACE BEING GREATER THAN OF THE PRESSURE RECEPTIVE FACE AND INCLUDING A RADIALLY EXTENDING LIP, AND A CIRCUMFERENTIAL EDGE INCLUDING A LIP SURFACE ON SAID LIP, A RELIEF SURFACE AND A SEALING SURFACE TERMINATING IN SAID FRONT PRESSURE RECEPTIVE FACE; THE THICKNESS OF THE PLUG AT ITS CENTRAL RECESSED PORTION BEING AT LEAST EQUAL TO THE WIDTH OF THE SEALING SURFACE BUT NOT EXCEEDING THE COMBINED WIDTH OF THE THE SEALING AND RELIEF SURFACES; THE THICKNESS OF SAID LIP BEING LESS THAN THE DEPTH OF THE RECESS IN SAID REAR FACE; SAID RELIEF SURFACE COOPERATING WITH SAID REAR RECESS TO ALLOW SAID LIP TO BE REARWARDLY FLEXED DURING REMOVAL OF A PLUG FROM A PIPE.
Claim 2
Dependent Claim
166 words
A SELF-ALIGNING, SELF-CENTERING, PRESSURE RESISTANT STOPPER PLUG READILY INSERTABLE INTO AND REMOVABLE FROM THE OPEN END OF A PIPE, COMPRISING: A CYLINDRICAL PLUG OF RESILIENT MATERIAL, SAID PLUG HAVING A CIRCULAR INTERNAL VIRTUALLY PLANAR PRESSURE RECEPTIVE FRONT FACE, A REAR FACE INCLUDING A CENTRAL RECESSED PORTION, THE DIAMETER OF SAID REAR FACE BEING GREATER THAN OF THE PRESSURE RECEPTIVE FACE AND INCLUDING A RADIALLY EXTENDING LIP, AND A CIRCUMFERENTIAL EDGE INCLUDING A LIP SURFACE ON SAID LIP, A RELIEF SURFACE AND A SEALING SURFACE TERMINATING IN SAID FRONT PRESSURE RECEPTIVE FACE; THE THICKNESS OF THE PLUG AT ITS CENTRAL RECESSED PORTION BEING AT LEAST EQUAL TO THE WIDTH OF THE SEALING SURFACE BUT NOT EXCEEDING THE COMBINED WIDTH OF THE THE SEALING AND RELIEF SURFACES; THE THICKNESS OF SAID LIP BEING LESS THAN THE DEPTH OF THE RECESS IN SAID REAR FACE; SAID RELIEF SURFACE COOPERATING WITH SAID REAR RECESS TO ALLOW SAID LIP TO BE REARWARDLY FLEXED DURING REMOVAL OF A PLUG FROM A PIPE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |