US3409185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grease gun plunger assembly
Assignee: EDWIN P SUNDHOLM
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Filing: 1965-04-20
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Granted: 1968-11-05
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Expires: 1985-04-20
Abstract
No abstract record available.
Inventors
- 👤 Edwin P Sundholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:54
CPC Classifications
F; F16; F16N; F16N3/00; F16N3/10; F16N3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN COMBINATION WITH A HAND GREASE GUN HAVING A CYLINDRICAL GREASE CONTAINER ADAPTED FOR BOTH BULK-FILLED GREASES AND CARTRIDGE-PACKAGED GREASES, AND AN AXIALLYEXTENDING ROD WITHIN SAID CONTAINER, A PLUNGER ASSEMBLY COMPRISING: (A) PISTON MEANS SLIDABLY RECEIVED ON SAID ROD FOR URGING GREASE TOWARD END OF SAID CONTAINER, THE OUTER PERIPHERAL PORTION OF SAID PISTON BEING SPACED INWARDLY FROM THE INNER SURFACE OF SAID CONTAINER TO PERMIT THE INSERTION OF A GREASE CARTRIDGAE WALL THEREBETWEEN, SAID OUTER PERIPHERAL PORTION PROVIDING AN ANNULAR RECESS FACING AND INNER CONTAINER SURFACE; (B) A SEALING RING RECEIVED IN SAID RECESS FOR INWARD AND OUT OUTWARD MOVEMENT THEREIN, SAID RING BEING FORMED OF A RESILIENT COMPRESSIBLE MATERIAL AND HAVING AN EXPANDED DIAMETER AT LEAST AS GREAT AS THE INTERNAL DIAMETER OF SAID CONTAINER FOR SEALING ENGAGEMENT THEREWITH, SAID RING DEFINING AND ARCUATE PERIPHERAL PORTION AND BEING COMPRESSIBLY CONTRACTABLE TO REDUCE THE EXTERNAL DIAMETER THEREOF WHILE MOVING INWARDLY IN SAID RECESS FOR ALTERNATIVE SEALING ENGAGEMENT WITH THE INNER SURFACE OF SAID GREASE CARTRIDGE WALL; AND
Claim 2
Dependent Claim
168 words
IN COMBINATION WITH A HAND GREASE GUN HAVING A CYLINDRICAL GREASE CONTAINER ADAPTED FOR BOTH BULK-FILLED GREASES AND CARTRIDGE-PACKAGED GREASES, AND AN AXIALLYEXTENDING ROD WITHIN SAID CONTAINER, A PLUNGER ASSEMBLY COMPRISING: (A) PISTON MEANS SLIDABLY RECEIVED ON SAID ROD FOR URGING GREASE TOWARD END OF SAID CONTAINER, THE OUTER PERIPHERAL PORTION OF SAID PISTON BEING SPACED INWARDLY FROM THE INNER SURFACE OF SAID CONTAINER TO PERMIT THE INSERTION OF A GREASE CARTRIDGAE WALL THEREBETWEEN, SAID OUTER PERIPHERAL PORTION PROVIDING AN ANNULAR RECESS FACING AND INNER CONTAINER SURFACE; (B) A SEALING RING RECEIVED IN SAID RECESS FOR INWARD AND OUT OUTWARD MOVEMENT THEREIN, SAID RING BEING FORMED OF A RESILIENT COMPRESSIBLE MATERIAL AND HAVING AN EXPANDED DIAMETER AT LEAST AS GREAT AS THE INTERNAL DIAMETER OF SAID CONTAINER FOR SEALING ENGAGEMENT THEREWITH, SAID RING DEFINING AND ARCUATE PERIPHERAL PORTION AND BEING COMPRESSIBLY CONTRACTABLE TO REDUCE THE EXTERNAL DIAMETER THEREOF WHILE MOVING INWARDLY IN SAID RECESS FOR ALTERNATIVE SEALING ENGAGEMENT WITH THE INNER SURFACE OF SAID GREASE CARTRIDGE WALL; AND
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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |