Film cassette having marker for identifying the exposure side of a medical radiograph
US5307397A · kind A · utility
2Cited by
4References
17Claims
0Family size
Inventor
Key dates
| Filing date | Jul 20, 1992 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Jul 20, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/547
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides an X ray film cassette with a permanent marking means for identifying the side of the radiographic film that faced the X ray tube during exposure. Such identification does not require any action by the X ray technologist, eliminating the element of human error. The marking means is comprised of chirally asymmetric X ray opaque and/or light-opaque letters or markings permanently mounted in the film cassette to intersect overlapping portions of an X ray path projected during exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.