US4350248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-Ray film cassette with magnetically attracted confining plates
Assignee: Agfa Gevaert AG
•
Filing: 1980-04-21
•
Granted: 1982-09-21
•
Expires: 2000-04-21
Abstract
Abstract An x-ray film cassette includes two cassette parts which are connected at one side by a hinge and which are cylindrically curved as considered in a plane normal to the hinge. The cassette part which constitutes the bottom carries a foil of ferromagnetic material floatingly supported on an elastic strip-sloped peripheral frame, and an intensifying shield supported on this foil, while the other cassette part which constitutes the top carries a magnetic plate supported on elongated projections of the cassette wall and supporting another intensifying shield. In the closed position of the cassette, the magnetic plate attracts the ferromagnetic foil to thereby eliminate air inclusions between the intensifying shields and the x-ray film interposed therebetween.
Inventors
- 👤 Walter Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:09
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
170 words
A film cassette, especially for x-ray film, comprising a pair of cassette parts movable between an open position and a closed position in which said cassette parts define a film-receiving space; a magnetic plate mounted on one of said cassette parts; a ferromagnetic foil on the other of said cassette parts responsive to the magnetic force of said magnetic plate in said closed position; and means floatingly supporting said foil on said other cassette part, wherein said floatingly supporting means includes an elastic member in the form of a narrow strip-shaped frame arranged at the periphery of said foil and interposed between said other cassette part and said foil, said other cassette part includes a cassette wall which is cylindrically inwardly curved in said open position; and wherein said elastic frame has such a height that said foil at most barely touches said cassette wall at a central region thereof and does not contact said cassette wall at the region within said narrow strip-shaped frame when in said closed position.
Claim 2
Dependent Claim
170 words
A film cassette, especially for x-ray film, comprising a pair of cassette parts movable between an open position and a closed position in which said cassette parts define a film-receiving space; a magnetic plate mounted on one of said cassette parts; a ferromagnetic foil on the other of said cassette parts responsive to the magnetic force of said magnetic plate in said closed position; and means floatingly supporting said foil on said other cassette part, wherein said floatingly supporting means includes an elastic member in the form of a narrow strip-shaped frame arranged at the periphery of said foil and interposed between said other cassette part and said foil, said other cassette part includes a cassette wall which is cylindrically inwardly curved in said open position; and wherein said elastic frame has such a height that said foil at most barely touches said cassette wall at a central region thereof and does not contact said cassette wall at the region within said narrow strip-shaped frame when in said closed position.
Claim 3
Dependent Claim
18 words
The film cassette as defined in claim 1, wherein said cassette parts are hingedly connected to one another.
Claim 4
Dependent Claim
14 words
The film cassette as defined in claim 1, wherein said magnetic plate is flexible.
Claim 5
Dependent Claim
18 words
The film cassette as defined in claim 1, wherein said magnetic plate is substantially coextensive with said space.
Claim 6
Dependent Claim
19 words
The film cassette as defined in claim 1, wherein said elastic member is of a material permeable by x-rays.
Claim 7
Dependent Claim
17 words
The film cassette as defined in claim 1, wherein said elastic member is of a foam material.
Claim 8
Dependent Claim
42 words
The film cassette as defined in claim 1, wherein said other cassette part has a rib extending along a substantially rectangular course around said film-receiving space, and wherein said elastic frame is situated at the inwardly facing side surface of said rib.
Claim 9
Dependent Claim
19 words
The film cassette as defined in claim 1, wherein said foil is approximately between 0.01 and 0.05 millimeters thick.
Claim 10
Dependent Claim
18 words
The film cassette as defined in claim 8, wherein the thickness of said foil is substantially 0.02 millimeters.
Claim 11
Dependent Claim
24 words
The film cassette as defined in claim 1; and further including an intensifying shield on the surface of said foil facing said film-receiving space.
Claim 12
Dependent Claim
18 words
The film cassette as defined in claim 10, wherein said intensifying shield is adhesively bonded to said foil.
Claim 13
Dependent Claim
29 words
The film cassette as defined in claim 1, further comprising a polyethylene foil having a thickness of at most 0.05 millimeters and forming a laminate with said ferromagnetic foil.
Claim 14
Dependent Claim
16 words
The film cassette as defined in claim 1, wherein said magnetic plate comprises an Alnico alloy.
Claim 15
Dependent Claim
16 words
The film cassette as defined in claim 1, wherein said magnetic plate comprises oxidic permanent magnets.
Claim 16
Dependent Claim
18 words
The film cassette as defined in claim 1, wherein said magnetic plate comprises a magnetically coated PVC foil.
Claim 17
Dependent Claim
20 words
The film cassette as defined in claim 1, wherein said magnetic plate comprises injection-molded magnets of oxide powder and binder.
Claim 18
Dependent Claim
57 words
The film cassette as defined in claim 1, wherein both said cassette parts include respective relatively thin elastically deformable cassette walls which assume cylindrical configurations in said open position, and reinforcing portions which cooperate with one another in said closed position to give said cassette walls substantially planar configurations and to reinforce the cassette against twisting deformation.
Claim 19
Dependent Claim
48 words
The film cassette as defined in claim 1, wherein said one cassette part includes a plurality of inwardly extending projecting portions; further comprising a relatively thin support plate of synthetic plastic material supported on said projecting portions; and wherein said magnetic plate is mounted on said support plate.
References Cited (Backward Citations)
US2590891A
Cited
US3317078A
Cited
US3504180A
Cited
US3441128A
Cited
US3949872A
Cited
US4081686A
Cited
US4157474A
Cited
US4264821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |