US3438709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic darkroom apparatus
Assignee: ROCKER SOLENOID CO
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Filing: 1966-10-10
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Granted: 1969-04-15
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Expires: 1986-10-10
Abstract
No abstract record available.
Inventors
- 👤 Kimio Hatashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:14
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
PHOTOGRAPHIC DARKROOM APPARATUS COMPRISING: FIRST MEANS, INCLUDING SURFACE FORMING MEANS, PROVIDING A FLAT WHITE SURFACE; SECOND MEANS, INCLUDING A TRANSLUCENT MEMBER HAVING A LIGHT DIFFUSING SURFACE HAVING A BOUNDARY SUBSTANTIALLY COEXTENSIVE WITH A BOUNDARY OF SAID FLAT WHITE SURFACE; THIRD MEANS, INCLUDING LIGHT-SOURCE MEANS AND MEANS FOR DIRECTING LIGHT FROM SAID SOURCE MEANS THROUGH SAID TRANSLUCENT MEMBER TO SAID DIFFUSING SURFACE, SAID THIRD MEANS BEING ADJUSTABLE TO VARY THE INTENSITY OF LIGHT DIFFUSED BY SAID DIFFUSING SURFACE; AND FOURTH MEANS, INCLUDING OPAQUE MEANS ARRANGED TO PROVIDE ALONG SAID BOUNDARY A COINCIDENT BOUNDARY OF A SHADOW PRODUCED THEREBY FROM IMAGE-PRODUCING LIGHT PROJECTED TOWARD SAID FLAT WHITE SURFACE AND SAID DIFFUSING SURFACE, WHEREBY BY ADJUSTMENT OF SAID THIRD MEANS SAID COINCIDENT BOUNDARY MAY BE MADE TO BE SUBSTANTIALLY EXTINCT.
Claim 2
Dependent Claim
127 words
PHOTOGRAPHIC DARKROOM APPARATUS COMPRISING: FIRST MEANS, INCLUDING SURFACE FORMING MEANS, PROVIDING A FLAT WHITE SURFACE; SECOND MEANS, INCLUDING A TRANSLUCENT MEMBER HAVING A LIGHT DIFFUSING SURFACE HAVING A BOUNDARY SUBSTANTIALLY COEXTENSIVE WITH A BOUNDARY OF SAID FLAT WHITE SURFACE; THIRD MEANS, INCLUDING LIGHT-SOURCE MEANS AND MEANS FOR DIRECTING LIGHT FROM SAID SOURCE MEANS THROUGH SAID TRANSLUCENT MEMBER TO SAID DIFFUSING SURFACE, SAID THIRD MEANS BEING ADJUSTABLE TO VARY THE INTENSITY OF LIGHT DIFFUSED BY SAID DIFFUSING SURFACE; AND FOURTH MEANS, INCLUDING OPAQUE MEANS ARRANGED TO PROVIDE ALONG SAID BOUNDARY A COINCIDENT BOUNDARY OF A SHADOW PRODUCED THEREBY FROM IMAGE-PRODUCING LIGHT PROJECTED TOWARD SAID FLAT WHITE SURFACE AND SAID DIFFUSING SURFACE, WHEREBY BY ADJUSTMENT OF SAID THIRD MEANS SAID COINCIDENT BOUNDARY MAY BE MADE TO BE SUBSTANTIALLY EXTINCT.
References Cited (Backward Citations)
US3187652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |