Patent US3387534A successfully refreshed from Google Patents.
US3387534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic focusing device
Assignee: Durst Group AG
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Filing: 1965-09-30
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Granted: 1968-06-11
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Expires: 1985-09-30
Abstract
No abstract record available.
Inventors
- 👤 Barbieri Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:16
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN AUTOMATIC FOCUSING DEVICE FOR OPTICAL SYSTEMS, SAID DEVICE INCLUDING A PATTERN CARRIER, AN OBJECTIVE LENS, A PROJECTION PLANE, LIGHT MEANS FOR ILLUMINATING THE PATTERN ON THE PROJECTION PLANE THROUGH SAID OBJECTIVE LENS, A SHUTTER ADJACENT SAID PATTERN CARRIER, MEANS FOR OCCULTING A PORTION OF SAID SHUTTER WHEREBY A PORTION OF SAID PROJECTION PLANE IS ILLUMINATED AND A PORTION OF SAID PROJECTION PLANE IS NON-ILLUMINATED, PHOTO CELL MEANS AT LEAST PARTIALLY IN SAID ILLUMINATED PORTION OF SAID PROJECTION PLANE, MEANS FOR INTERMITTENTLY INTERRUPTING THE PATH OF LIGHT FROM SAID LIGHT MEANS FOR CREATING A CURRENT IN SAID PHOTOCELL MEANS WHEN SAID SYSTEM IS OUT OF FOCUS, AND MEANS RESPONSIVE TO SAID CURRENT FOR MOVING ONE OF SAID PATTERN CARRIER, OBJECTIVE LENS AND PROJECTION PLANE UNTIL A SHARP FOCUSING IS ACHIEVED WHEN SAID CURRENT IS REDUCED TO ZERO.
Claim 2
Dependent Claim
137 words
AN AUTOMATIC FOCUSING DEVICE FOR OPTICAL SYSTEMS, SAID DEVICE INCLUDING A PATTERN CARRIER, AN OBJECTIVE LENS, A PROJECTION PLANE, LIGHT MEANS FOR ILLUMINATING THE PATTERN ON THE PROJECTION PLANE THROUGH SAID OBJECTIVE LENS, A SHUTTER ADJACENT SAID PATTERN CARRIER, MEANS FOR OCCULTING A PORTION OF SAID SHUTTER WHEREBY A PORTION OF SAID PROJECTION PLANE IS ILLUMINATED AND A PORTION OF SAID PROJECTION PLANE IS NON-ILLUMINATED, PHOTO CELL MEANS AT LEAST PARTIALLY IN SAID ILLUMINATED PORTION OF SAID PROJECTION PLANE, MEANS FOR INTERMITTENTLY INTERRUPTING THE PATH OF LIGHT FROM SAID LIGHT MEANS FOR CREATING A CURRENT IN SAID PHOTOCELL MEANS WHEN SAID SYSTEM IS OUT OF FOCUS, AND MEANS RESPONSIVE TO SAID CURRENT FOR MOVING ONE OF SAID PATTERN CARRIER, OBJECTIVE LENS AND PROJECTION PLANE UNTIL A SHARP FOCUSING IS ACHIEVED WHEN SAID CURRENT IS REDUCED TO ZERO.
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |