Patent US3664556A successfully refreshed from Google Patents.
US3664556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand pump oiler
Assignee: Dutton Lainson Co
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Filing: 1970-06-24
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Granted: 1972-05-23
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Expires: 1990-06-24
Abstract
Abstract AN IMPROVED HAND PUMP OILER WHICH INCLUDES A FIXED PISTON HAVING A PORT THERETHROUGH IS CONNECTED WITH THE OILER SPOUT. A MOVABLE CYLINDER SLIDES OVER THE PISTON TO PUMP OIL THROUGH THE SPOUT UPON EACH PUMPING STROKE OF THE CYLINDER. A SINGLE INLET CHECK VALVE IS INCLUDED IN THE CYLINDER AND AN INTEGRAL PISTON VALVE IS PROVIDED BETWEEN THE CYLINDER AND PISTON. A PLASTIC STRAP SPRING COUNTERACTS MOVEMENT OF THE HAND PUMP LEVER, THUS INSURING A RETURN STROKE OF THE CYLINDER.
Inventors
- 👤 Max W Perry
- 👤 Norman D Brockelsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:25
CPC Classifications
F; F16; F16N; F16N3/00; F16N3/02; F16N3/04; F16N3/08
Claims Analysis
Total Claims: 0
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |