US4557728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring-operated liquid-dispensing device
Assignee: Koru Medical Systems Inc
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Filing: 1984-04-16
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Granted: 1985-12-10
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Expires: 2004-04-16
Abstract
Abstract Involved is a device, noteworthy by its compact construction, portability and use of a cooperating pair of constant torque springs to dispense liquid under a uniform force, in which any binding in the slide that is urged through movement by the torque springs is obviated, so that the slide tracks properly during liquid-dispensing service of the device.
Inventors
- 👤 Andrew Sealfon
- 👤 Carl Yurdin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:06
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/148
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
234 words
A spring-operated device for dispensing a liquid for achieving a medical or similar objective, said device comprising a rectangular-shaped housing bounding an internal compartment having a top cover disposed in covering relation over said compartment, said cover having a centrally located slot oriented longitudinally thereof opening into said compartment, a source of liquid in a collapsible bag disposed in said compartment, a slide member disposed in said compartment in pushing contact against said liquid-filled bag, a pair of constant torque springs of the type adapted to assume the form of helical coils disposed along opposite sides of said compartment and each operatively connected at one end to said slide member and at said opposite end to an end of said housing so as to urge said slide member through sliding movement through said compartment in response to said assumption of said helical coils at said end connected to said slide member, an upstanding leg on said slide member in projected relation into said slot of said cover so as to be adapted to track along said slot during said sliding movement of said slide member, a tracking member disposed for tracking movement in said slot of said cover attached to said projecting end of said upstanding leg of said slide member, and a clip means connected to said housing for selectively engaging said tracking member preparatory to commencing the liquid-dispensing service of said device.
Claim 2
Dependent Claim
234 words
A spring-operated device for dispensing a liquid for achieving a medical or similar objective, said device comprising a rectangular-shaped housing bounding an internal compartment having a top cover disposed in covering relation over said compartment, said cover having a centrally located slot oriented longitudinally thereof opening into said compartment, a source of liquid in a collapsible bag disposed in said compartment, a slide member disposed in said compartment in pushing contact against said liquid-filled bag, a pair of constant torque springs of the type adapted to assume the form of helical coils disposed along opposite sides of said compartment and each operatively connected at one end to said slide member and at said opposite end to an end of said housing so as to urge said slide member through sliding movement through said compartment in response to said assumption of said helical coils at said end connected to said slide member, an upstanding leg on said slide member in projected relation into said slot of said cover so as to be adapted to track along said slot during said sliding movement of said slide member, a tracking member disposed for tracking movement in said slot of said cover attached to said projecting end of said upstanding leg of said slide member, and a clip means connected to said housing for selectively engaging said tracking member preparatory to commencing the liquid-dispensing service of said device.
Claim 3
Dependent Claim
44 words
A spring-operated liquid-dispensing device as claimed in claim 1 wherein a detachable connection is established between the contacting surfaces of the liquid-filled bag and said slide member, to thereby provide an option of replacing or reusing said bag in subsequent use of said device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |