US3331300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera rangefinder
Assignee: Berkey Photo Inc
•
Filing: 1965-10-08
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Granted: 1967-07-18
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Expires: 1985-10-08
Abstract
No abstract record available.
Inventors
- 👤 Henry A Froehlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:08
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/18; G03B13/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A CAMERA RANGEFINDER COMPRISING: (A) A LENS SYSTEM INCLUDING AN ENTRANCE LENS AND A VIEWING LENS FOR PRODUCING AN IMAGE COMPOSING BEAM OBSERVABLE TO THE EYE OF A PHOTOGRAPHER THROUGH SAID VIEWING LENS, (B) A SECOND LENS SYSTEM INCLUDING A PIVOTED MIRROR AS WELL AS THE VIEWING LENS OF SAID FIRST MENTIONED LENS SYSTEM FOR PRODUCING A SPOT IMAGE BEAM ALSO OBSERVABLE TO THE EYE OF THE PHOTOGRAPHER, (C) A BEAM SPLITTER INTERPOSED IN THE PATH OF BOTH OF SAID BEAMS AND OPERABLE TO TRANSMIT SAID IMAGE COMPOSING BEAM AND FOR REFLECTING SAID SPOT IMAGE BEAM INTO AXIAL COINCIDENCE WITH SAID IMAGE COMPOSING BEAM SO THAT SAID SPOT IMAGE BEAM IS OBSERVED SUPERIMPOSED ON A LIMITED AREA OF THE LATTER WHEN SEEN ON SAID VIEWING LENS, AND (D) A SMALL NEUTRAL DENSITY FILTER DISPOSED IN THE PATH OF SAID IMAGE COMPOSING BEAM FOR DECREASING THE INCIDENT TRANSMITTED LIGHT INTENSITY OVER AN AREA ONLY SLIGHTLY GREATER THAN THAT OF THE SUPERIMPOSED SPOT IMAGE BEAM TO INCREASE THE CONTRAST BETWEEN THE LATTER AND THE SURROUNDING IMAGE COMPOSING BEAM.
Claim 2
Dependent Claim
176 words
A CAMERA RANGEFINDER COMPRISING: (A) A LENS SYSTEM INCLUDING AN ENTRANCE LENS AND A VIEWING LENS FOR PRODUCING AN IMAGE COMPOSING BEAM OBSERVABLE TO THE EYE OF A PHOTOGRAPHER THROUGH SAID VIEWING LENS, (B) A SECOND LENS SYSTEM INCLUDING A PIVOTED MIRROR AS WELL AS THE VIEWING LENS OF SAID FIRST MENTIONED LENS SYSTEM FOR PRODUCING A SPOT IMAGE BEAM ALSO OBSERVABLE TO THE EYE OF THE PHOTOGRAPHER, (C) A BEAM SPLITTER INTERPOSED IN THE PATH OF BOTH OF SAID BEAMS AND OPERABLE TO TRANSMIT SAID IMAGE COMPOSING BEAM AND FOR REFLECTING SAID SPOT IMAGE BEAM INTO AXIAL COINCIDENCE WITH SAID IMAGE COMPOSING BEAM SO THAT SAID SPOT IMAGE BEAM IS OBSERVED SUPERIMPOSED ON A LIMITED AREA OF THE LATTER WHEN SEEN ON SAID VIEWING LENS, AND (D) A SMALL NEUTRAL DENSITY FILTER DISPOSED IN THE PATH OF SAID IMAGE COMPOSING BEAM FOR DECREASING THE INCIDENT TRANSMITTED LIGHT INTENSITY OVER AN AREA ONLY SLIGHTLY GREATER THAN THAT OF THE SUPERIMPOSED SPOT IMAGE BEAM TO INCREASE THE CONTRAST BETWEEN THE LATTER AND THE SURROUNDING IMAGE COMPOSING BEAM.
References Cited (Backward Citations)
US2127925A
Cited
US2317810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |