Patent US3905366A successfully refreshed from Google Patents.
US3905366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection syringe with shiftable comparison indicator
Assignee: Individual
•
Filing: 1973-08-01
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Granted: 1975-09-16
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Expires: 1993-08-01
Abstract
Abstract A syringe for injections has a scale and an index or comparison mark arranged for relative displacement so that they may be reset to zero before each injection thus to permit accurate determination of each dose.
Inventors
- 👤 George Edgar Callahan
- 👤 Lothar Barensfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:56
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31565; A61M5/31576; A61M5/31578; A61M5/3158; A61M5/31525; A61M5/31533; A61M5/31545; A61M5/31548; A61M5/3155; A61M5/31551; A61M2005/3125; A61M2005/3126; A61M5/28; A61M5/285; A61M5/288; A61M5/3159; A61M5/31593; A61M5/32; A61M5/3202
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
Injection syringe comprising cylinder means having a closed end receiving one end of a cannula therethrough, a piston in said cylinder means, means for shifting said piston longitudinally in said cylinder means to dispense a dose of fluid from said cylinder through the cannula, a dosage scale associated with said means for shifting said piston, and a dosage comparison indicator positioned in a portion of said cylinder means to indicate the dosage discharged upon movement of said piston in said cylinder means, said indicator being shiftable in said cylinder to reset the dosage indication at the starting point after each discharge.
Claim 2
Dependent Claim
101 words
Injection syringe comprising cylinder means having a closed end receiving one end of a cannula therethrough, a piston in said cylinder means, means for shifting said piston longitudinally in said cylinder means to dispense a dose of fluid from said cylinder through the cannula, a dosage scale associated with said means for shifting said piston, and a dosage comparison indicator positioned in a portion of said cylinder means to indicate the dosage discharged upon movement of said piston in said cylinder means, said indicator being shiftable in said cylinder to reset the dosage indication at the starting point after each discharge.
Claim 3
Dependent Claim
37 words
Injection syringe according to claim 1, wherein the means for shifting the piston comprises a stop device for moving the comparison indicator into zero position upon insertion of the means for shifting the piston into the piston.
Claim 4
Dependent Claim
67 words
Injection syringe according to claim 1, wherein the comparison indicator is arranged shiftably in a portion of the cylinder means, a spring is provided for urging the comparison indicator against the stop device and in that, for fixing the comparison indicator in zero position against the force of the spring before injection, stop means are provided between the comparison indicator and said portion of the cylinder means.
Claim 5
Dependent Claim
72 words
Injection syringe according to claim 3, wherein said portion of the cylinder means comprises a transparent tubular extension of the cylinder means, said comparison indicator comprises a ring encircling the means for shifting the piston and in that the stop means is a complementary gearing provided in segments on the inside of the tubular extension and the outside of said ring which can be engaged or disengaged by rotation of the ring.
Claim 6
Dependent Claim
69 words
Injection syringe according to claim 4, wherein a tube member having inner gearing is provided within said extension and the comparison indicator or ring and means for shifting the piston and tubular extension are provided with complementary longitudinal guiding grooves wherefore rotation of the extension with respect to the cylinder means or the tube member engages or disengages the complementary gearings on the ring and on the tube member.
Claim 7
Dependent Claim
47 words
Injection syringe according to claim 4, wherein the comparison indicator or ring and means for shifting the piston are provided with complementary longitudinal grooves wherefore rotation of the means for shifting the piston engages or disengages the Complementary gearings on the ring and on the tubular extension.
Claim 8
Dependent Claim
49 words
Injection syringe according to claim 4, wherein the comparison indicator comprises a ring encircling the means for shifting the piston, and the stop device is a lever passing through the tubular extension for ratchet engagement with the surface of the ring with the comparison indicator directed in one direction.
Claim 9
Dependent Claim
52 words
Injection syringe according to claim 7, wherein the means for shifting the piston comprises at least one limit stop at a distance corresponding to a predetermined partial dosage, the stop being indirectly engageable with the cylinder means during discharge, wherefore the piston advance is locked after delivery of the predetermined partial dosage.
Claim 10
Dependent Claim
23 words
Injection syringe according to claim 8, wherein the distance of the stop from the cylinder means can be adjusted to select various dosages.
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |