Patent US4556750A successfully refreshed from Google Patents.
Patent US3289607A successfully refreshed from Google Patents.
US3289607A
Expired / Lapsed
US
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Pump apparatus
Assignee: Individual
•
Filing: 1964-06-25
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Granted: 1966-12-06
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Expires: 1984-06-25
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Delligatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
F; F04; F04B; F04B15/00; F04B15/02; F04B15/023; F04B19/00; F04B19/08; F04B19/12; F04B53/00; F04B53/10; F04B53/1002; F04B53/101; F04B53/12; F04B53/122; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PISTON CONSTRUCTION COMPRISING A PISTON HEAD HAVING A PASSAGEWAY THERETHROUGH, SAID PASSAGEWAY HAVING REARWARDLY AND FORWARDLY FACING CONICALLY SHAPED SECTIONS DEFINING A RESTRICTION IN SAID PASSAGEWAY, A CONNECTING ROD RECEIVABLE WITHIN SAID PASSAGEWAY, SAID CONNECTING ROD HAVING A FORWARDLY FACING SURFACE COMPLEMENTARY TO AND ENGAGEABLE WITH THE REARWARDLY FACING CONICALLY SHAPED SECTION OF SAID PASSAGEWAY DURING THE PUMP STROKE THEREOF FOR CLOSING SAID PASSAGEWAY AND SAID CONNECTING ROD HAVING A PLURALITY OF FORWARDLY AND OUTWARDLY EXTENDING ARM MEMBERS HAVING THE ENDS THEREOF ENGAGEABLE WITH THE FORWARD END OF SAID PISTON HEAD DURING THE RETURN STROKE OF SAID CONNECTING ROD WHEREBY THE PISTON HEAD MAY BE MOVED WHILE PERMITTING SAID PASSAGEWAY TO REMAIN OPEN, EACH OF SAID ARM MEMBERS HAVING A SLENDER CROSS-SECTIONAL CONFIGURATION.
Claim 2
Dependent Claim
124 words
A PISTON CONSTRUCTION COMPRISING A PISTON HEAD HAVING A PASSAGEWAY THERETHROUGH, SAID PASSAGEWAY HAVING REARWARDLY AND FORWARDLY FACING CONICALLY SHAPED SECTIONS DEFINING A RESTRICTION IN SAID PASSAGEWAY, A CONNECTING ROD RECEIVABLE WITHIN SAID PASSAGEWAY, SAID CONNECTING ROD HAVING A FORWARDLY FACING SURFACE COMPLEMENTARY TO AND ENGAGEABLE WITH THE REARWARDLY FACING CONICALLY SHAPED SECTION OF SAID PASSAGEWAY DURING THE PUMP STROKE THEREOF FOR CLOSING SAID PASSAGEWAY AND SAID CONNECTING ROD HAVING A PLURALITY OF FORWARDLY AND OUTWARDLY EXTENDING ARM MEMBERS HAVING THE ENDS THEREOF ENGAGEABLE WITH THE FORWARD END OF SAID PISTON HEAD DURING THE RETURN STROKE OF SAID CONNECTING ROD WHEREBY THE PISTON HEAD MAY BE MOVED WHILE PERMITTING SAID PASSAGEWAY TO REMAIN OPEN, EACH OF SAID ARM MEMBERS HAVING A SLENDER CROSS-SECTIONAL CONFIGURATION.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |