Patent US3269258A successfully refreshed from Google Patents.
US3269258A
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Means for correcting depth-of-field error in a projection system
Assignee: Brunswick Corp
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Filing: 1964-04-09
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Granted: 1966-08-30
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Expires: 1984-04-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Byrd
- 👤 Paul G Andrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:18
CPC Classifications
G; G02; G02B; G02B1/00; Y; Y10; Y10S; Y10S353/00; Y10S353/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
A PROJECTION SYSTEM COMPRISING A LIGHT TRANSMITTING PRISM HAVING AN INTERNALLY REFLECTING SURFACE FOR RECEIVING A REFLECTIVITY DESTROYING MARK THEREON, A LIGHT SOURCE AND MEANS ASSOCIATED THEREWITH FOR DIRECTING LIGHT THROUGH SAID PRISM TOWARD SAID INTERNALLY REFLECTING SURFACE AND REFLECTING AN IMAGE THEREFROM EXITING FROM THE PRISM THROUGH A SECOND SURFACE OF SAID PRISM, MEANS INCLUDING A PROJECTION LENS FOR DIRECTING THE IMAGE FROM THE PRISM TO A VIEWING SCREEN, AND TRIANGULAR PRISM MEANS IN THE PATH OF LIGHT EXITING FROM SAID SECOND SURFACE BETWEEN THE PRISM REFLECTING SURFACE AND PROJECTION LENS FOR AT LEAST PARTIALLY CORRECTING DEPTH OF FIELD ERROR IN THE REFLECTED IMAGE AS VIEWED BY THE PROJECTION LENS.
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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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |