US3588217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coherent optical noise suppression apparatus
Assignee: International Business Machines Corp
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Filing: 1969-06-17
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Granted: 1971-06-28
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Expires: 1989-06-17
Abstract
Abstract IN AN APPARATUS FOR DISPLAYING THE IMAGE OF A HOLOGRAM, A FIBER OPTIC DEVICE IS LOCATED TO FORM PART OF THE PATH OF THE COHERENT LIGHT ILLUMINATING THE HOLOGRAM AND IS MOVED AT ITS MIDSECTION WHILE THE ENDS ARE HELD RIGID AS THE HOLOGRAM IS VIEWED. THIS OPERATION OF THE APPARATUS CHANGES THE INTERFERENCE PATTERNS THAT ARE ATTRIBUTABLE TO THE LIGHT SOURCE AND NOT THE HOLOGRAM AND THEREBY REDUCES SPECKLE NOISE THAT OTHERWISE OCCURS IN THE HOLOGRAM.
Inventors
- 👤 Einar S Mathisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:27
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/32; H; H01; H01S; H01S3/00; H01S3/005
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |