Patent US3368253A successfully refreshed from Google Patents.
US3368253A
Expired / Lapsed
US
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Pipe lining trowel
Assignee: Perkins Pipe Linings Inc
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Filing: 1965-11-22
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Granted: 1968-02-13
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Expires: 1985-11-22
Abstract
No abstract record available.
Inventors
- 👤 John T Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:01
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
TROWEL MEANS ADAPTED TO BE DRAWN THROUGH A PIPE FOR SMOOTHING AN INTERNAL LAYER OF LINING MATERIAL COMPRISING A GENERALLY FRUSTO-CONICAL TROWEL BODY, A TRACTION MEMBER EXTENDING FORWARDLY FROM SAID TROWEL BODY FOR DRAWING THE SAME THROUGH THE PIPE SMALL END FIRST, COUPLING MEANS FOR CONNECTION OF SAID TROWEL TO SAID TRACTION MEMBER, AND MEANS CONNECTING BETWEEN SAID COUPLING MEANS AND SAID TROWEL BODY FOR SUPPORTING SAID COUPLING MEANS SUBSTANTIALLY AXIALLY OF SAID FRUSTO-CONICAL TROWEL BODY ADJACENT TO THE LARGE END THEREOF.
Claim 2
Dependent Claim
82 words
TROWEL MEANS ADAPTED TO BE DRAWN THROUGH A PIPE FOR SMOOTHING AN INTERNAL LAYER OF LINING MATERIAL COMPRISING A GENERALLY FRUSTO-CONICAL TROWEL BODY, A TRACTION MEMBER EXTENDING FORWARDLY FROM SAID TROWEL BODY FOR DRAWING THE SAME THROUGH THE PIPE SMALL END FIRST, COUPLING MEANS FOR CONNECTION OF SAID TROWEL TO SAID TRACTION MEMBER, AND MEANS CONNECTING BETWEEN SAID COUPLING MEANS AND SAID TROWEL BODY FOR SUPPORTING SAID COUPLING MEANS SUBSTANTIALLY AXIALLY OF SAID FRUSTO-CONICAL TROWEL BODY ADJACENT TO THE LARGE END THEREOF.
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |