US3742949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syringe assembly
Assignee: Individual
•
Filing: 1972-02-14
•
Granted: 1973-07-03
•
Expires: 1992-02-14
Abstract
Abstract Syringe with a nonlubricated plunger body having a narrow sealing bearing, a centering bearing, and a rear socket with a bore extending inside said bearings and socket, and a plunger rod having a mounting portion with a tapered end and having sharp ridges which engage said bore.
Inventors
- 👤 C Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:31
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31565; A61M5/3159; A61M5/31591; A61M5/31533; A61M5/31545; A61M5/31548; A61M5/3155; A61M5/31551; A61M5/31576; A61M5/31578; A61M5/3158; A61M5/31501; A61M2005/31508; A61M5/31511; A61M5/31515
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
113 words
A syringe comprising a barrel having a bore, a plunger body having a front sealing bearing, an intermediately located centering bearing of a diameter smaller than said front sealing bearing and a rear socket wall, said bearings being slidable in said bore; a plunger rod mounted in said rear socket wall for propelling said plunger body along in said bearings; a volume stop longitudinally movably mounted on said plunger rod; and means on said rod for locking said volume stop in selected volume determining positions; said rear socket wall being bendable and forming an elastic mounting for tHe forward portion of said rod to permit said rod to be inclined in said bore.
Claim 2
Dependent Claim
113 words
A syringe comprising a barrel having a bore, a plunger body having a front sealing bearing, an intermediately located centering bearing of a diameter smaller than said front sealing bearing and a rear socket wall, said bearings being slidable in said bore; a plunger rod mounted in said rear socket wall for propelling said plunger body along in said bearings; a volume stop longitudinally movably mounted on said plunger rod; and means on said rod for locking said volume stop in selected volume determining positions; said rear socket wall being bendable and forming an elastic mounting for tHe forward portion of said rod to permit said rod to be inclined in said bore.
Claim 3
Dependent Claim
31 words
A syringe as claimed in claim 1, in which said plunger body is of dimensionally stable material with a low coefficient of friction, adequate sealing qualities and which is readily sterilizable.
Claim 4
Dependent Claim
13 words
A syringe as claimed in claim 2, in which said material is tetrafluoroethylene.
Claim 5
Dependent Claim
22 words
A syringe as claimed in claim 1, in which said front sealing bearing has a length of from 0.02 to 0.05 inch.
Claim 6
Dependent Claim
27 words
A syringe as claimed in claim 1, in which said front sealing bearing has a diameter larger than the syringe bore by from 0.0024 to 0.0035 inch.
Claim 7
Dependent Claim
25 words
A syringe as claimed in claim 1, in which said centering bearing has a diameter less than the syringe bore by 0.0005 to 0.004 inch.
Claim 8
Dependent Claim
31 words
A syringe as claimed in claim 1, in which said plunger has a central hole extending through said rear socket wall on inside said centering bearing and within said sealing bearing.
Claim 9
Dependent Claim
41 words
A syringe as claimed in claim 7, in which the barrel has a bore of about 0.2530 inch, said rear socket wall has a thickness of about one-sixteenth inch, and the center hole has a diameter of about three thirty-seconds inch.
Claim 10
Dependent Claim
42 words
A syringe as claimed in claim 7, in which said plunger rod has a mounting portion which enters said central hole, extends through said rear socket wall, and has means to prevent the inner end thereof from passing beyond said centering bearing.
Claim 11
Dependent Claim
32 words
A syringe as claimed in claim 9 in which said mounting portion has separate parallel external ridges with sharp edges to facilitate cutting of the plunger body material and plastic deformation thereof.
Claim 12
Dependent Claim
29 words
A syringe as claimed in claim 1, in which said plunger body is made from a centerless ground tetrafluoroethylene rod plus or minus 0.0005 inch tolerance on the diameter.
Claim 13
Dependent Claim
22 words
A syringe as claimed in claim 10, in which the centering bearing is positioned forward of the ridges in said mounting portion.
Claim 14
Dependent Claim
28 words
A syringe as claimed in claim 12, in which the sharp ridges have edges approximately 0.01 inch greater than the diameter of the central hole in the plunger.
Claim 15
Dependent Claim
22 words
A syringe as claimed in claim 13, in which the forward end of the plunger rod is angled to a reduced diameter.
Claim 16
Dependent Claim
28 words
A syringe as claimed in claim 1, in which said volume stop has a simple cylindrical external shape to facilitate centering of the plunger rod in the barrel.
Claim 17
Dependent Claim
31 words
A syringe as claimed in claim 1, in which said rear socket wall has a rear centering bearing of a diameter slightly less than that of the bore of said barrel.
References Cited (Backward Citations)
US1648135A
Cited
US2695613A
Cited
FR1104570A
Cited
US2895773A
Cited
US2832340A
Cited
FR1500009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |