US3977560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized fluid container with built in filter
Assignee: Frigitronics Inc
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Filing: 1975-04-17
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Granted: 1976-08-31
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Expires: 1995-04-17
Abstract
Abstract There is disclosed a pressurized Freon cylinder having a cap including a threaded nipple with a puncturable end wall. Positioned within the nipple, by screwing into its internal threads, is a porous plastic filter in the path of the fluid as it leaves the container.
Inventors
- 👤 Joseph G. Stumpf
- 👤 Richard L. Testani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:15
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/107; B; B65; B65D; B65D51/00; B65D51/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A container for fluid refrigerants which comprises: a substantially cylindrical can having an open mouth concentric therewith; a normally non-removable cap closing said mouth and defining a hollow thin wall, cylindrical nipple concentric with said mouth and cap, extending outwardly therefrom and including a needle-pierceable end wall, the cylindrical wall of said nipple being deformed to simultaneously define complementary external and internal threads thereon; and a cylindrical porous filter within said nipple in threaded engagement with said internal threads in the path of refrigerant discharged from said container through the pierced end wall.
Claim 2
Dependent Claim
93 words
A container for fluid refrigerants which comprises: a substantially cylindrical can having an open mouth concentric therewith; a normally non-removable cap closing said mouth and defining a hollow thin wall, cylindrical nipple concentric with said mouth and cap, extending outwardly therefrom and including a needle-pierceable end wall, the cylindrical wall of said nipple being deformed to simultaneously define complementary external and internal threads thereon; and a cylindrical porous filter within said nipple in threaded engagement with said internal threads in the path of refrigerant discharged from said container through the pierced end wall.
Claim 3
Dependent Claim
16 words
The container of claim 1 wherein said filter defines an axial recess adjacent said end wall.
Claim 4
Dependent Claim
11 words
The container of claim 1 wherein said filter is porous plastic.
Claim 5
Dependent Claim
11 words
The container of claim 2 wherein said filter is porous plastic.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |