Depressurized underwater one-time-use camera with seal integrity indicator and method
US6636697B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2001 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Dec 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a photography method, a partial vacuum is provided within a pressure housing of a camera having an unexposed film unit. The camera is sealed against both air entry and venting, while in the partial vacuum. The camera is kept sealed until the film unit is fully exposed and while sealed, a relative pressure differential between the interior of the camera and an environment external to the camera is continuous indicated. The camera has a housing having an internal cavity water-tightly sealed from the external environment. The internal cavity has an unsubmerged internal pressure, at room temperature, less than air pressure at sea level. The camera has a camera frame assembly disposed in the internal cavity and a seal integrity indicator that provides the continuous indication of the relative pressure differential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.