US3623786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic phase hologram
Assignee: US Philips Corp
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Filing: 1970-01-05
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Granted: 1971-11-30
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Expires: 1990-01-05
Abstract
Abstract A synthetic hologram made up of groups of rectangular elements each group extending a different distance above a substrate, where the distances of the groups of elements above the substrate are equal to interval multiples of one-fourth wavelength of the radiation used to reconstruct the hologram.
Inventors
- 👤 Hans Dammann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:31
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/08; G03H1/0891; G03H1/02; G03H1/024; G03H1/0244; G03H1/0841; G03H2001/085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A synthetic phase hologram for use with a reconstruction radiation having a particular wavelength, comprising a substrate, a first plurality of rectangular optical elements extending a distance above the substrate equal to a fractional part of the wavelength of the reconstruction radiation, and a second plurality of rectangular optical elements extending a distance above the substrate equal to a different fractional part of the wavelength of the reconstruction radiation.
Claim 2
Dependent Claim
69 words
A synthetic phase hologram for use with a reconstruction radiation having a particular wavelength, comprising a substrate, a first plurality of rectangular optical elements extending a distance above the substrate equal to a fractional part of the wavelength of the reconstruction radiation, and a second plurality of rectangular optical elements extending a distance above the substrate equal to a different fractional part of the wavelength of the reconstruction radiation.
Claim 3
Dependent Claim
26 words
A synthetic phase hologram as claimed in claim 1, wherein the surfaces of the different rectangular optical elements remote from the substrate lie in nonparallel planes.
Claim 4
Dependent Claim
13 words
A synthetic phase hologram as claimed in claim 1, further comprising absorption portions.
Claim 5
Dependent Claim
25 words
A synthetic phase hologram as claimed in claim 3, wherein the absorption portions comprise a separate hologram arranged in the path of the reconstruction radiation.
Claim 6
Dependent Claim
30 words
A synthetic phase hologram as claimed in claim 1, wherein the surfaces of the rectangular optical elements remote from the substrate and the surfaces of the substrate are reflecting surfaces.
Claim 7
Dependent Claim
19 words
A synthetic phase hologram as claimed in claim 1, wherein the substrate comprises the surface of an optical device.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |