Patent US3304870A successfully refreshed from Google Patents.
US3304870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plunger diaphragm pump
Assignee: GROWALL Manufacturing CO
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Filing: 1965-02-15
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Granted: 1967-02-21
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Expires: 1985-02-15
Abstract
No abstract record available.
Inventors
- 👤 William H Growall
- 👤 Wiseman James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:21
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/025; F04B43/026; F04B43/06; F04B43/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PLUNGER-DIAPHRAGM TYPE PUMP STRUCTURE, COMPRISING A PAIR OF RECIPROCATORY PLUNGER UNITS EACH INCLUDING A PLUNGER HEAD OPERATING IN A CYLINDER SPACE TO DISCHARGE A PRESSURE FLUID FROM AN END OF SAID SPACE, A DRIVE UNIT INCLUDING A LOBE CAM COMMON TO SAID PLUNGER UNITS TO OPERATE THE PLUNGER HEADS IN SYNCHRONISM, SAID DRIVE UNIT COMPRISING A FOLLOWER DEVICE PIVOTALLY MOUNTED ON EACH OF SAID HEADS IN RADIAL RELATION TO SAID CAM, EACH FOLLOWER DEVICE COMPRISING A CRADLE PIVOTED ON A PLUNGER HEAD, EACH CRADLE HAVING MEANS JOURNALING A PAIR OF FOLLOWER ROLLS THEREON IN LATERALLY SPACED RELATION TO ONE ANOTHER FOR SIMULTANEOUS ROLLING ENGAGEMENT WITH A LOBE SURFACE OF SAID CAM, AND A DIAPHRAGM UNIT HAVING DIAPHRAGM MEANS IN COMMUNICATION WITH SAID CYLINDER SPACES TO BE OPERATED BY SAID PRESSURE FLUID, SAID DIAPHRAGM UNIT IN TURN PRESSURIZING A FLUID TO BE PUMPED.
Claim 2
Dependent Claim
143 words
A PLUNGER-DIAPHRAGM TYPE PUMP STRUCTURE, COMPRISING A PAIR OF RECIPROCATORY PLUNGER UNITS EACH INCLUDING A PLUNGER HEAD OPERATING IN A CYLINDER SPACE TO DISCHARGE A PRESSURE FLUID FROM AN END OF SAID SPACE, A DRIVE UNIT INCLUDING A LOBE CAM COMMON TO SAID PLUNGER UNITS TO OPERATE THE PLUNGER HEADS IN SYNCHRONISM, SAID DRIVE UNIT COMPRISING A FOLLOWER DEVICE PIVOTALLY MOUNTED ON EACH OF SAID HEADS IN RADIAL RELATION TO SAID CAM, EACH FOLLOWER DEVICE COMPRISING A CRADLE PIVOTED ON A PLUNGER HEAD, EACH CRADLE HAVING MEANS JOURNALING A PAIR OF FOLLOWER ROLLS THEREON IN LATERALLY SPACED RELATION TO ONE ANOTHER FOR SIMULTANEOUS ROLLING ENGAGEMENT WITH A LOBE SURFACE OF SAID CAM, AND A DIAPHRAGM UNIT HAVING DIAPHRAGM MEANS IN COMMUNICATION WITH SAID CYLINDER SPACES TO BE OPERATED BY SAID PRESSURE FLUID, SAID DIAPHRAGM UNIT IN TURN PRESSURIZING A FLUID TO BE PUMPED.
References Cited (Backward Citations)
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US2217796A
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US2362822A
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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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |