Patent US4650987A successfully refreshed from Google Patents.
US4650987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chest for the storage of light sensitive film material or paper
Assignee: Individual
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Filing: 1985-05-28
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Granted: 1987-03-17
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Expires: 2005-05-28
Abstract
Abstract An apparatus for the prevention of the unintentional exposure of photo material includes an electromagnetically locking flap on an apparatus designed as a storage chest for photo material. The flap as a cover for said chest and a photocell or the like respond to the luminosity of the environment. In the case of the prevalence of an adequate darkness a solenoid affects the magnet so as to unlock the cover.
Inventors
- 👤 Klaus P. R. Schwuchow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:32
CPC Classifications
G; G03; G03D; G03D17/00; Y; Y10; Y10S; Y10S70/00; Y10S70/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
Apparatus for the light-safe storage of photosensitive materials comprising: a light-safe storage chest; an access door on said chest; means for electronically locking said access door in a closed position; and means for unlocking said access door in predetermined low light conditions said means including a photocell mounted on said chest and an electric circuit for transmitting the condition of said photocell to said electronic locking means.
Claim 2
Dependent Claim
67 words
Apparatus for the light-safe storage of photosensitive materials comprising: a light-safe storage chest; an access door on said chest; means for electronically locking said access door in a closed position; and means for unlocking said access door in predetermined low light conditions said means including a photocell mounted on said chest and an electric circuit for transmitting the condition of said photocell to said electronic locking means.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said electronic locking means includes a magnetically operated lock and a solenoid.
Claim 4
Dependent Claim
25 words
The apparatus of claim 1 wherein said access door is mounted on said storage chest such that it closes by means of its own weight.
Claim 5
Dependent Claim
26 words
The apparatus of claim 2 wherein said solenoid is activated in a predetermined light condition by means of said electric circuit to unlock said access door.
Claim 6
Dependent Claim
18 words
The apparatus of claim 2 wherein said electronic locking means locks said door whenever said solenoid is unactivated.
Claim 7
Dependent Claim
20 words
The apparatus of claim 2 wherein said solenoid is unactivated above a predetermined low light condition and during power failure.
References Cited (Backward Citations)
US3198883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |