Patent US3176619A successfully refreshed from Google Patents.
US3176619A
Expired / Lapsed
US
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Plunger construction
Assignee: Camco Inc
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Filing: 1961-04-13
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Granted: 1965-04-06
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Expires: 1981-04-13
Abstract
No abstract record available.
Inventors
- 👤 William A Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:01
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A FLUID OPERATED PLUNGER FOR TRAVEL IN A SECTIONAL EDUCATION TUBE, THE COMBINATION COMPRISING: A TUBULAR BODY, A VALVE ON THE TUBULAR BODY OPERABLE TO PREVENT FLOW OF FLUID THERETHROUGH, EXPANSIBLE SEALING ELEMENTS ON THE BODY ADAPTED FOR SEALING ENGAGEMENT WITH THE INTERIOR OF THE EDUCATION TUBE, SAID SEALING ELEMENTS INCLUDING A PAIR OF SEGMENTAL RINGS, EACH OF SAID SEGMENTAL RINGS COMPRISING A PLURALITY OF RING SEGMENTS, THE RING SEGMENTS OF ONE SEGMENTAL RING EACH HAVING A PAIR OF AXIALLY EXTENDING CIRCUMFERENTIALLY SPACED PINS PROJECTING INTO RECESSES PROVIDED ON THE SEGMENTS OF THE OTHER SEGMENTAL RING, RESILIENT MEANS ACTING ON SAID SEGMENTS TO MOVE THEM RADIALLY OUTWARD, AND MEANS ON THE BODY LIMITING OUTWARD MOVEMENT OF SAID SEGMENTS.
Claim 2
Dependent Claim
119 words
IN A FLUID OPERATED PLUNGER FOR TRAVEL IN A SECTIONAL EDUCATION TUBE, THE COMBINATION COMPRISING: A TUBULAR BODY, A VALVE ON THE TUBULAR BODY OPERABLE TO PREVENT FLOW OF FLUID THERETHROUGH, EXPANSIBLE SEALING ELEMENTS ON THE BODY ADAPTED FOR SEALING ENGAGEMENT WITH THE INTERIOR OF THE EDUCATION TUBE, SAID SEALING ELEMENTS INCLUDING A PAIR OF SEGMENTAL RINGS, EACH OF SAID SEGMENTAL RINGS COMPRISING A PLURALITY OF RING SEGMENTS, THE RING SEGMENTS OF ONE SEGMENTAL RING EACH HAVING A PAIR OF AXIALLY EXTENDING CIRCUMFERENTIALLY SPACED PINS PROJECTING INTO RECESSES PROVIDED ON THE SEGMENTS OF THE OTHER SEGMENTAL RING, RESILIENT MEANS ACTING ON SAID SEGMENTS TO MOVE THEM RADIALLY OUTWARD, AND MEANS ON THE BODY LIMITING OUTWARD MOVEMENT OF SAID SEGMENTS.
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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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |