US3282178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light metering means for cameras
Assignee: Individual
•
Filing: 1963-10-21
•
Granted: 1966-11-01
•
Expires: 1983-10-21
Abstract
No abstract record available.
Inventors
- 👤 Noel R Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:40
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09976
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
IN A CAMERA HAVING A LIGHT METERING MEANS AND AN IMAGE VIEWING PROJECTION SYSTEM, A PARTIALLY REFLECTING AND PARTIALLY TRANSMITTING BEAM SPLITTER SURFACE IN SAID SYSTEM IN THE PATH OF THE IMAGE VIEWING PROJECTION, AND ADAPTED TO DIVERT A SMALL SAMPLE PORTION OF THE LIGHT BEAM OUT OF SAID PATH, SAID PORTION BEING OF AN INTENSITY PROPORTIONAL TO THAT OF THE LIGHT BEAM, SAID BEAM SPLITTER SURFACE HAVING THEREON A PREDOMINANT REFLECTIVE AREA OF GRID FORM WHICH DIRECTS THE MAJOR PORTION OF SAID LIGHT BEAM IN THE PATH OF THE IMAGE VIEWING PROJECTION, AND SAID BEAM SPLITTER SURFACE BEING LOCATED BETWEEN THE REFLECTIVE GRID AREAS WHICH DIVERTS A SMALL PORTION OF THE LIGHT BEAM TO A PHOTOCELL, AND A LIGHT METER PHOTOCELL LOCATED OUTSIDE OF SAID PATH AND MOUNTED IN A POSITION TO RECEIVE SAID SMALL PORTION OF THE LIGHT BEAM WHICH IS TRANSMITTED BY THE BEAM SPLITTER SURFACE.
Claim 2
Dependent Claim
149 words
IN A CAMERA HAVING A LIGHT METERING MEANS AND AN IMAGE VIEWING PROJECTION SYSTEM, A PARTIALLY REFLECTING AND PARTIALLY TRANSMITTING BEAM SPLITTER SURFACE IN SAID SYSTEM IN THE PATH OF THE IMAGE VIEWING PROJECTION, AND ADAPTED TO DIVERT A SMALL SAMPLE PORTION OF THE LIGHT BEAM OUT OF SAID PATH, SAID PORTION BEING OF AN INTENSITY PROPORTIONAL TO THAT OF THE LIGHT BEAM, SAID BEAM SPLITTER SURFACE HAVING THEREON A PREDOMINANT REFLECTIVE AREA OF GRID FORM WHICH DIRECTS THE MAJOR PORTION OF SAID LIGHT BEAM IN THE PATH OF THE IMAGE VIEWING PROJECTION, AND SAID BEAM SPLITTER SURFACE BEING LOCATED BETWEEN THE REFLECTIVE GRID AREAS WHICH DIVERTS A SMALL PORTION OF THE LIGHT BEAM TO A PHOTOCELL, AND A LIGHT METER PHOTOCELL LOCATED OUTSIDE OF SAID PATH AND MOUNTED IN A POSITION TO RECEIVE SAID SMALL PORTION OF THE LIGHT BEAM WHICH IS TRANSMITTED BY THE BEAM SPLITTER SURFACE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |