Patent US3717415A successfully refreshed from Google Patents.
US3717415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short interval holographic comparison
Assignee: US Philips Corp
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Filing: 1971-07-12
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Granted: 1973-02-20
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Expires: 1991-07-12
Abstract
Abstract A METHOD OF, AND AN APPARATUS FOR, HOLOGRAPHIC COMPARISON ARE DESCRIBED IN WHICH AT A FIRST INSTANT A HOLOGRAM OF AN OBJECT IS MADE, THIS HOLOGRAM IS SO RECONSTRUCTED AT A SECOND INSTANT THAT AN IMAGE OF THE OBJECT IS FORMED AT THE ORIGINAL POSITION OF THE OBJECT AND THE IMAGE IS COMPARED WITH THE OBJECT ITSELF AT THE SECOND INSTANT. IT IS SHOWN THAT BY THE DIRECT PRODUCTION OF THE HOLOGRAM BY MEANS OF OPTICAL CHANGES IN A NON-LINEAR OPTICAL MEDIUM AND BY RECONSTRUCTING THIS HOLOGRAM A VERY SHORT TIME AFTERWARDS THE OBJECT MAY BE COMPARED WITH ITSELF AT TWO CLOSELY PROXIMATE INSTANTS. D R A W I N G
Inventors
- 👤 J Woerdman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:07
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |