Patent US3895522A successfully refreshed from Google Patents.
US3895522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sight glass for metal liquid containers
Assignee: Individual
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Filing: 1974-04-29
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Granted: 1975-07-22
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Expires: 1994-04-29
Abstract
Abstract The embodiment of the invention disclosed herein is directed to a sight glass assembly for metal liquid containers which includes a cylindrical sleeve portion to be positioned about the liquid container and sealed relative thereto. The sight glass assembly has the transparent window formed across an opening at one end of the cylindrical sleeve and piercing means extend from a point radially inwardly of the cylindrical sleeve to engage and pierce the bottom portion of the metal container. The liquid within the metal container can then flow into a chamber formed between the bottom wall of the container and the transparent window so that the quantity of liquid within the container can be viewed when the container is held on its side. The sight glass is graduated to indicate the number of fluid ounces within the container.
Inventors
- 👤 John A Skvarenina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:32
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
In combination a sight glass and a liquid container, said sight glass comprising: a cylindrical sleeve to be positioned about said liquid container at a sealed end thereof, said cylindrical sleeve having an opening that extends beyond said end of the container first securing means position about said container, second securing means on said cylindrical sleeve for engagement with said first securing means, a transparent window element secured across said opening of said cylindrical sleeve to be positioned adjacent the bottom of the container to form a chamber therewith, piercing means mounted on said cylindrical sleeve and positioned radially inwardly thereof to engage the bottom of the container and puncture same when said cylindrical sleeve is tightened by said first and second secUring means, and annular seal means formed within said cylindrical sleeve to provide a fluid tight seal for said chamber when the bottom of the container is punctured by said piercing means, whereby the liquid within the container will enter said chamber for viewing to determine the quantity of liquid within the container.
Claim 2
Dependent Claim
175 words
In combination a sight glass and a liquid container, said sight glass comprising: a cylindrical sleeve to be positioned about said liquid container at a sealed end thereof, said cylindrical sleeve having an opening that extends beyond said end of the container first securing means position about said container, second securing means on said cylindrical sleeve for engagement with said first securing means, a transparent window element secured across said opening of said cylindrical sleeve to be positioned adjacent the bottom of the container to form a chamber therewith, piercing means mounted on said cylindrical sleeve and positioned radially inwardly thereof to engage the bottom of the container and puncture same when said cylindrical sleeve is tightened by said first and second secUring means, and annular seal means formed within said cylindrical sleeve to provide a fluid tight seal for said chamber when the bottom of the container is punctured by said piercing means, whereby the liquid within the container will enter said chamber for viewing to determine the quantity of liquid within the container.
Claim 3
Dependent Claim
44 words
The sight glass for containers as set forth in claim 1, wherein said transparent window element has graduated scale means formed thereon to indicate the quantity of liquid within the container when laid on its side with the longitudinal axis thereof held substantially horizontal.
Claim 4
Dependent Claim
29 words
The sight glass for containers as set forth in claim 2, wherein said scale means is arranged to indicate the relative amount of liquid within containers of different volumes.
Claim 5
Dependent Claim
62 words
The sight glass for containers as set forth in claim 1, wherein said second securing means is a threaded portion a said cylindrical sleeve, said first securing means is a threaded collet engaging said threaded portion, and an O-ring seal means cooperable with said threaded portion and said threaded collet to form a fluid tight seal about the periphery of the container.
Claim 6
Dependent Claim
52 words
The sight glass for containers as set forth in claim 4, wherein said O-ring seal means is formed by a first O-ring positioned between said cylindrical sleeve and said threaded collet and a second O-ring seal positioned between said collet and the periphery of the liquid container receiving the sight glass structure.
Claim 7
Dependent Claim
62 words
The sight glass for containers as set forth in claim 1, wherein said cylindrical sleeve is provided with internal threads and wherein the liquid container has a seam formed about the periphery of the bottom of the container, said seam being configurated to form at least a partial thread to engage the internal thread of said cylindrical sleeve and threadedly tighten therewith.
Claim 8
Dependent Claim
59 words
The sight glass for containers as set forth in claim 6, further including O-ring seal means formed about the periphery of said internal thread and engageable with the liquid container when inserted in said cylindrical sleeve to form a seal between the cylindrical sleeve and said container prior to puncturing the bottom of the container with said piercing means.
Claim 9
Dependent Claim
112 words
The sight glass for containers as set forth in claim 1, wherein said cylindrical sleeve includes a first sleeve portion having a radially inwardly turned portion to engage the upper shoulder of the metal liquid container, tabs extending outwardly from said first sleeve portion on opposite sides thereof, a second sleeve portion concentric with said first sleeve portion and slidable relative thereto, and snap-lock means extending from said second sleeve portion toward said first sleeve portion to engage said tabs to draw said first and second sleeve portions tightly together, whereby said piercing means will puncture the bottom of the metal liquid container to allow the liquid therein to enter said chamber.
Claim 10
Dependent Claim
46 words
A sight glass for containers as set forth in claim 8, further including O-ring seal means having a first O-ring positioned between said first and second sleeve portions and a second O-ring positioned between said first sleeve portion and the periphery of said metal, liquid container.
Claim 11
Dependent Claim
37 words
The sight glass for containers as set forth in claim 1, further including valve means extending from said cylindrical sleeve and include communication with said chamber to provide a fluid outlet for the liquid within the container.
References Cited (Backward Citations)
US3505870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |