US2843508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypodermic syringe defreezing means and method
Assignee: Individual
•
Filing: 1953-09-29
•
Granted: 1958-07-15
•
Expires: 1973-09-29
Abstract
No abstract record available.
Inventors
- 👤 Matthew J Sheft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
A; A61; A61M; A61M5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
THE METHOD OF RELEASING A FROZEN AND NORMALLY RECIPROCABLE PISTON DISPOSED WITHIN A CYLINDER, COMPRISING FILLING WITH AN EXPANSIBLE LIQUID WETTING AGENT A PORTABLE RECEPTACLE ADAPTED TO BE FREELY SUPPORTED IN THE HANDS OF A HUMAN BEING, COUPLING SAID RECEPTACLE TO SAID CYLINDER TO EFFECT OPEN COMMUNICATION BETWEEN SAID CYLINDER AND SAID RECEPTACLE, AND SUBJECTING SAID RECEPTACLE TO A SUFFICIENTLY HIGHER TEMPRATURE THAN SAID LIQUID TO EXPAND THE LATTER TO A DEGREE WHEREIN IT IS INTRODUCED INTO SAID CLYINDER AT SUCH A RATE THAT IT PENETRATES AND BREAKS THE FREEZING SEAL BETWEEN SAID PISTON AND SAID CYLINDER TO FORCE RELEASE OF SAID PISTON.
Claim 2
Independent Claim
103 words
THE METHOD OF RELEASING A FROZEN AND NORMALLY RECIPROCABLE PISTON DISPOSED WITHIN A CYLINDER, COMPRISING FILLING WITH AN EXPANSIBLE LIQUID WETTING AGENT A PORTABLE RECEPTACLE ADAPTED TO BE FREELY SUPPORTED IN THE HANDS OF A HUMAN BEING, COUPLING SAID RECEPTACLE TO SAID CYLINDER TO EFFECT OPEN COMMUNICATION BETWEEN SAID CYLINDER AND SAID RECEPTACLE, AND SUBJECTING SAID RECEPTACLE TO A SUFFICIENTLY HIGHER TEMPRATURE THAN SAID LIQUID TO EXPAND THE LATTER TO A DEGREE WHEREIN IT IS INTRODUCED INTO SAID CLYINDER AT SUCH A RATE THAT IT PENETRATES AND BREAKS THE FREEZING SEAL BETWEEN SAID PISTON AND SAID CYLINDER TO FORCE RELEASE OF SAID PISTON.
Claim 3
Dependent Claim
254 words
MEANS FOR FREEING A FROZEN PLUNGER IN A HYPODERMIC SYRINGE OF THE TYPE HAVING A BARREL EQUIPPED WITH A PLUNGER NORMALLY RECIPROCABLE WITHIN THE BARREL AND A COUPLING ELEMENT ON ONE END OF THE BARREL FOR COOPERATION WITH COUPLING MEANS ON ONE END OF A HYPODERMIC NEEDLE FOR DETACHABLY CONNECTING THE NEEDLE TO SAID BARREL, COMPRISING A PORTABLE FLASK ADAPTED TOS BE FREELY SUPPORTED IN THE HANDS OF A HUMAN BEING AND HAVING WALLS OF A MATERIAL THAT READILY CONDUCTS HEAT, SAID FLASK DEFINING A CHAMBER OF A CONSTANT PREDETERMINED VOLUME FOR CONTAINING AN EXPANSIBLE LIQUID AND HAVING A SINGLE PORT COMMUNICATING WITH SAID CHAMBER THROUGH WHICH SAID LIQUID FLOWS, SAID WALLS BEING FIXED RELATIVE TO EACH OTHER AND STRUCTURALLY INTEGRALLY CONNECTED TOGETHER TO MAINTAIN THE CONSTANCY OF SAID VOLUME AGAINST VARIATION FOR EFFECTING FLOW OF SAID LIQUID OUT OF SAID CHAMBER THROUGH SAID PORT UPON EXPANSION OF SAID LIQUID BY HEAT WHEN SAID FLASK IS HEATED TO A PRE-ESTABLISHED DEGREE, AND COUPLING MEANS ON SAID FLASK SUBSTANTIALLY LIKE AND COUPLING MEANS ON SAID NEEDLE FOR COOPERATION WITH SAID COUPLING ELEMENT FOR DETACHABLY CONNECTING SAID FLASK TO THE BARREL TO PREVENT SEPARATION OF SAID BARREL AND SAID FLASK UNDER THE INFLUENCE OF PRESSURE ALONE AND TO ESTABLISH COMMUNICATION BETWEEN SAID FLASK AND THE BARREL THROUGH SAID PORT SO AS TO PERMIT FLOW OF SAID LIQUID INTO SAID BARREL FROM SAID CHAMBER TO ENGAGE AND RELEASE SAID FROZEN PLUNGER UPON EXPANSION OF SAID LIQUID INTO SAID BARREL WHEN SAID FLASK IS HEATED TO SAID DEGREE.
Claim 4
Dependent Claim
254 words
MEANS FOR FREEING A FROZEN PLUNGER IN A HYPODERMIC SYRINGE OF THE TYPE HAVING A BARREL EQUIPPED WITH A PLUNGER NORMALLY RECIPROCABLE WITHIN THE BARREL AND A COUPLING ELEMENT ON ONE END OF THE BARREL FOR COOPERATION WITH COUPLING MEANS ON ONE END OF A HYPODERMIC NEEDLE FOR DETACHABLY CONNECTING THE NEEDLE TO SAID BARREL, COMPRISING A PORTABLE FLASK ADAPTED TOS BE FREELY SUPPORTED IN THE HANDS OF A HUMAN BEING AND HAVING WALLS OF A MATERIAL THAT READILY CONDUCTS HEAT, SAID FLASK DEFINING A CHAMBER OF A CONSTANT PREDETERMINED VOLUME FOR CONTAINING AN EXPANSIBLE LIQUID AND HAVING A SINGLE PORT COMMUNICATING WITH SAID CHAMBER THROUGH WHICH SAID LIQUID FLOWS, SAID WALLS BEING FIXED RELATIVE TO EACH OTHER AND STRUCTURALLY INTEGRALLY CONNECTED TOGETHER TO MAINTAIN THE CONSTANCY OF SAID VOLUME AGAINST VARIATION FOR EFFECTING FLOW OF SAID LIQUID OUT OF SAID CHAMBER THROUGH SAID PORT UPON EXPANSION OF SAID LIQUID BY HEAT WHEN SAID FLASK IS HEATED TO A PRE-ESTABLISHED DEGREE, AND COUPLING MEANS ON SAID FLASK SUBSTANTIALLY LIKE AND COUPLING MEANS ON SAID NEEDLE FOR COOPERATION WITH SAID COUPLING ELEMENT FOR DETACHABLY CONNECTING SAID FLASK TO THE BARREL TO PREVENT SEPARATION OF SAID BARREL AND SAID FLASK UNDER THE INFLUENCE OF PRESSURE ALONE AND TO ESTABLISH COMMUNICATION BETWEEN SAID FLASK AND THE BARREL THROUGH SAID PORT SO AS TO PERMIT FLOW OF SAID LIQUID INTO SAID BARREL FROM SAID CHAMBER TO ENGAGE AND RELEASE SAID FROZEN PLUNGER UPON EXPANSION OF SAID LIQUID INTO SAID BARREL WHEN SAID FLASK IS HEATED TO SAID DEGREE.
References Cited (Backward Citations)
US145217A
Cited
US1121802A
Cited
US1793068A
Cited
US1865289A
Cited
US1863755A
Cited
US1999571A
Cited
US2682070A
Cited
US2637668A
Cited
DE809697C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |