Patent US4394772A successfully refreshed from Google Patents.
US4394772A
Expired / Lapsed
US
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Radiographic cassette
Assignee: OKAMOTO MANUFACTURING Co Ltd A CORP OF JAPAN
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Filing: 1981-12-03
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Granted: 1983-07-19
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Expires: 2001-12-03
Abstract
Abstract A radiographic cassette comprises a film-receiving plate and a film-keeping plate engageable with the film-receiving plate. The cassette is further provided with an external indicator which enables an operator to visually check whether or not the cassette has been loaded with a film.
Inventors
- 👤 Tadaomi Okamoto
- 👤 Masayuki Ohta
- 👤 Makoto Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:40
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/04; G03B2206/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A radiographic cassette comprising a film-receiving plate and a film-keeping plate engageable with said film-receiving plate in light-tight relation to press a film against said film-receiving plate, in which said film-keeping plate is provided with a solar battery and a liquid crystal indicator adapted to be actuated by currents therefrom, both being open to view, and provided on its inner surface with a pair of conductive planes isolated from each other and connected to said battery, and said film-receiving plate is provided on an associated position of its inner surface with a conductive plate which is adapted to come in contact with said conductive planes to cause shorting.
Claim 2
Dependent Claim
108 words
A radiographic cassette comprising a film-receiving plate and a film-keeping plate engageable with said film-receiving plate in light-tight relation to press a film against said film-receiving plate, in which said film-keeping plate is provided with a solar battery and a liquid crystal indicator adapted to be actuated by currents therefrom, both being open to view, and provided on its inner surface with a pair of conductive planes isolated from each other and connected to said battery, and said film-receiving plate is provided on an associated position of its inner surface with a conductive plate which is adapted to come in contact with said conductive planes to cause shorting.
References Cited (Backward Citations)
US2900514A
Cited
US3655972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |