US3155090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypodermic syringe operating means
Assignee: Holter Co
•
Filing: 1962-01-10
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Granted: 1964-11-03
•
Expires: 1982-01-10
Abstract
No abstract record available.
Inventors
- 👤 John W Holter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:32
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/1452; A61M5/1456; A61M5/007; Y; Y10; Y10S; Y10S128/00; Y10S128/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
APPARATUS FOR AUTOMATICALLY INJECTING A LIQUID INTO A FLUID SYSTEM AT A CONTROLLED PRESSURE COMPRISING A SYRINGE CONTAINING SAID LIQUID AND INCLUDING A PISTON FOR DISCHARGING SAID LIQUID THEREFROM, AN INJECTOR CONNECTED TO SAID SYRINGE FOR INJECTING SAID LIQUID INTO SAID SYSTEM, A DRIVE MOTOR OPERATIVELY CONNECTED TO ADVANCE SAID PISTON SO AS TO DISCHARGE LIQUID FROM SAID SYRINGE, AND MEANS RESPONSIVE TO PRESSURE VARIATIONS OF SAID DISCHARGED LIQUID ABOVE AND BELOW A PREDETERMINED PRESSURE FOR AUTOMATICALLY INTERRUPTING AND RESUMING THE ADVANCE OF SAID PISTON WHEREBY SAID LIQUID IS INJECTED AT A CONTROLLED PRESSURE.
Claim 2
Dependent Claim
94 words
APPARATUS FOR AUTOMATICALLY INJECTING A LIQUID INTO A FLUID SYSTEM AT A CONTROLLED PRESSURE COMPRISING A SYRINGE CONTAINING SAID LIQUID AND INCLUDING A PISTON FOR DISCHARGING SAID LIQUID THEREFROM, AN INJECTOR CONNECTED TO SAID SYRINGE FOR INJECTING SAID LIQUID INTO SAID SYSTEM, A DRIVE MOTOR OPERATIVELY CONNECTED TO ADVANCE SAID PISTON SO AS TO DISCHARGE LIQUID FROM SAID SYRINGE, AND MEANS RESPONSIVE TO PRESSURE VARIATIONS OF SAID DISCHARGED LIQUID ABOVE AND BELOW A PREDETERMINED PRESSURE FOR AUTOMATICALLY INTERRUPTING AND RESUMING THE ADVANCE OF SAID PISTON WHEREBY SAID LIQUID IS INJECTED AT A CONTROLLED PRESSURE.
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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) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |