US3402637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sharp focusing device for enlarger
Assignee: Durst Group AG
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Filing: 1966-04-22
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Granted: 1968-09-24
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Expires: 1986-04-22
Abstract
No abstract record available.
Inventors
- 👤 Durst Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:27
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/62; G03B27/6271
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A SHARP FOCUSING DEVICE FOR DISPOSING A BEAM SPLITTING DIAPHRAGM IN THE OPTICAL AXIS OF AN OBJECT FOR USE IN ENLARGEMENT APPARATUS, CHARACTERIZED IN THAT SAID BEAM SPLITTING DIAPHRAGM IS LOCATED NEAR THE OBJECTIVE SAID DIAPHRAGM BEING PROVIDED WITH TWO JUXTAPOSED OPENINGS, A NEGATIVE HOLDER, A TEST NEGATIVE BUILT IN TO SAID HOLDER, COUPLING MEANS CONNECTING SAID DIAPHRAGM TO SAID TEST NEGATIVE WHEREBY SAID DIAPHRAGM IS AUTOMATICALLY DISPOSED IN SAID OPTICAL AXIS WHEN SAID TEST NEGATIVE IS PLACED OVER SAID OBJECTIVE.
Claim 2
Dependent Claim
81 words
A SHARP FOCUSING DEVICE FOR DISPOSING A BEAM SPLITTING DIAPHRAGM IN THE OPTICAL AXIS OF AN OBJECT FOR USE IN ENLARGEMENT APPARATUS, CHARACTERIZED IN THAT SAID BEAM SPLITTING DIAPHRAGM IS LOCATED NEAR THE OBJECTIVE SAID DIAPHRAGM BEING PROVIDED WITH TWO JUXTAPOSED OPENINGS, A NEGATIVE HOLDER, A TEST NEGATIVE BUILT IN TO SAID HOLDER, COUPLING MEANS CONNECTING SAID DIAPHRAGM TO SAID TEST NEGATIVE WHEREBY SAID DIAPHRAGM IS AUTOMATICALLY DISPOSED IN SAID OPTICAL AXIS WHEN SAID TEST NEGATIVE IS PLACED OVER SAID OBJECTIVE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |