Patent US3554673A successfully refreshed from Google Patents.
US3554673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syringe pump
Assignee: Sage Instruments Inc
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Filing: 1969-01-31
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Granted: 1971-01-12
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Expires: 1989-01-31
Abstract
Abstract THE MOTORS FOR THE SEPARATELY RECIPROCATING DRIVE MECHANISMS OF A TWO BARREL SYRINGE PUMP ARE PROVIDED WITH ELECTRIC CONTROL CIRCUITS AND SWITCHES WHICH ARE ACTUATED BY THE RECIPROCATING DEVICE MECHANISMS AND WHICH CAUSE A FULLY WITHDRAWN SYRINGE TO COMMENCE INFUSION JUST BEFORE THE OTHER SYRINGE COMPLETES INFUSION, THE SWITCHES ALSO CAUSING SOLENOID VALVE MEANS TO OPERATE IN PHASED RELATION TO THE INFUSION OF THE SYRINGES WHEREBY THE INFUSION IS CARRIED OUT AT A CONSTANT RATE WITHOUT PERCEPTIBLE INTERRUPTIONS OR SURGES WHEN THE INFUSION OF FLUID CHANGES OVER FROM ONE SYRINGE TO THE OTHER AND BACK AGAIN.
Inventors
- 👤 Joel M Schwartz
- 👤 Daniel F Krebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:49
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/1452; A61M5/1456
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |