Patent US4550444A successfully refreshed from Google Patents.
US3662753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syringe
Assignee: Individual
•
Filing: 1970-05-25
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Granted: 1972-05-16
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Expires: 1990-05-25
Abstract
Abstract A syringe assembly enabling mixed discharge of substances retained in separated condition until intended use, employing a plunger and barrel arrangement that retains the substances separated during storage, allows mixing thereof prior to discharge, and causes discharge of the mixed substances.
Inventors
- 👤 Kitchener B Tassell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:23
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/28; A61M5/284; A61M5/31; A61M5/32; A61M5/34; A61M5/348; A61M5/3129; A61M5/3137; A61M2005/3139; A61M5/315; A61M5/31501; A61M2005/3151; A61M5/285; A61M5/288; A61M5/3202
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
193 words
A syringe assembly capable of normally retaining two substances separated and of subsequently allowing mixing thereof, comprising: an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end; a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and to a position externally of said barrel to enable said plunger head to be shifted along said barrel; said barrel having at least two portions of differing diameters extending along its length, the larger being toward said plunger inlet end and the smaller toward said discharge end; said plunger head having releasable seal means operative to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to release the seal when said plunger head is shifted away from said discharge end and into said larger diameter portion, allowing passage of one substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toWard said discharge end to discharge the mixed substances.
Claim 2
Dependent Claim
193 words
A syringe assembly capable of normally retaining two substances separated and of subsequently allowing mixing thereof, comprising: an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end; a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and to a position externally of said barrel to enable said plunger head to be shifted along said barrel; said barrel having at least two portions of differing diameters extending along its length, the larger being toward said plunger inlet end and the smaller toward said discharge end; said plunger head having releasable seal means operative to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to release the seal when said plunger head is shifted away from said discharge end and into said larger diameter portion, allowing passage of one substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toWard said discharge end to discharge the mixed substances.
Claim 3
Dependent Claim
34 words
The syringe in claim 1 including a smooth transition zone between said portions of differing diameters to allow said plunger head to retain its seal to said barrel when shifted toward said discharge end.
Claim 4
Dependent Claim
68 words
The syringe in claim 1 wherein said plunger head has a flexible peripheral sealing lip extending radially outwardly and diagonally toward said discharge end into engagement with said barrel, to be forced by pressure into sealing engagement with said barrel when shifted toward said discharge end and to be flexed out of sealing engagement with said barrel by said one substance when shifted away from said discharge end.
Claim 5
Dependent Claim
43 words
The syringe in claim 1 wherein said barrel has a needle assembly fitting, is of a polymeric material, and includes an integral polymeric portion forming a puncturable closure at said discharge end for puncture thereof by a needle when attached to said fitting.
Claim 6
Dependent Claim
150 words
A syringe assembly capable of normally retaining two substances separate and of subsequently allowing mixing thereof, comprising: an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end; a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and externally of said barrel to enable said plunger head to be shifted along said barrel; said plunger head having releasable seal means operative to form a seal with respect to said barrel to maintain substances separated in said barrel, to release the seal when said plunger head is shifted away from said discharge end to allow movement of a substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to discharge the mixed substances.
Claim 7
Dependent Claim
150 words
A syringe assembly capable of normally retaining two substances separate and of subsequently allowing mixing thereof, comprising: an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end; a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and externally of said barrel to enable said plunger head to be shifted along said barrel; said plunger head having releasable seal means operative to form a seal with respect to said barrel to maintain substances separated in said barrel, to release the seal when said plunger head is shifted away from said discharge end to allow movement of a substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to discharge the mixed substances.
Claim 8
Dependent Claim
181 words
A syringe assembly capable of normally retaining two substances separate and of subsequently allowing mixing thereof, comprising: an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end; a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and externally of said barrel to enable said plunger head to be shifted along said barrel; said barrel having at least two portions of differing diameters extending along its length, the larger diameter being toward said plunger inlet end and the smaller diameter toward said discharge end; said plunger head having releasable seal means operative to form a seal with respect to said barrel to maintain substances separated in said barrel, to release the seal when said plunger head is shifted away from said discharge end to allow movement of a substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to discharge the mixed substances.
Claim 9
Dependent Claim
181 words
A syringe assembly capable of normally retaining two substances separate and of subsequently allowing mixing thereof, comprising: an elongated barrel having a discharge end for cooperation with a syringe needle means, and a plunger inlet end; a plunger having a plunger head in said barrel and a plunger shaft extending through said plunger inlet end and externally of said barrel to enable said plunger head to be shifted along said barrel; said barrel having at least two portions of differing diameters extending along its length, the larger diameter being toward said plunger inlet end and the smaller diameter toward said discharge end; said plunger head having releasable seal means operative to form a seal with respect to said barrel to maintain substances separated in said barrel, to release the seal when said plunger head is shifted away from said discharge end to allow movement of a substance therepast for mixing of the substances, and to form a seal with respect to said barrel when said plunger head is shifted in said barrel toward said discharge end, to discharge the mixed substances.
Claim 10
Dependent Claim
37 words
The syringe as defined in claim 5 wherein said discharge end of said barrel includes a needle assembly fitting thereon having a section of reduced outer diameter for pressed fit locking engagement with a syringe needle means.
Claim 11
Dependent Claim
36 words
The syringe in claim 7 wherein said needle assembly fitting includes an internal integral membrane therein sealing said discharge end, said membrane forming a puncturable closure for puncture by a needle when attached to said fitting.
Claim 12
Dependent Claim
34 words
The syringe in claim 8 including a smooth transition zone between said portions of differing diameters to allow said plunger head to retain its seal with said barrel when shifted toward said discharge end.
References Cited (Backward Citations)
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |