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Patent US3821722A successfully refreshed from Google Patents.
US3821722A
Expired / Lapsed
US
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Method of effecting cyclic reversible holographic recording in a thermo plastic material
Assignee: Siemens AG
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Filing: 1973-05-16
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Granted: 1974-06-28
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Expires: 1993-05-16
Abstract
Abstract A method of effecting cyclic, reversible, holographic recording in a thermoplastic material including the steps of sensitizing the thermoplastic material by placing the same by a corona charge at a positive or negative potential and thereafter performing a holographic exposure and developing and fixing by cooling the resultant hologram. By increasing the number of recording cycles, the corona discharge voltage required for sensitizing is increased and the thermoplastic material is therefore placed at progressively higher positive or negative potentials.
Inventors
- 👤 J Ost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:54
CPC Classifications
G; G03; G03G; G03G16/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A method of carrying out cyclic, reversible, holographic recording in a thermoplastic material, comprising the steps of: creating a corona charge with a corona discharge voltage; sensitizing thermoplastic material with the corona charge prior to each new recording cycle; progressively increasing the corona discharge voltage to increase the corona charge for sensitizing prior to each new recording cycle; holographically exposing the sensitized thermoplastic material; heating the exposed material to produce a surface relief; and fixing the surface relief by cooling the thermoplastic material.
Claim 2
Independent Claim
83 words
A method of carrying out cyclic, reversible, holographic recording in a thermoplastic material, comprising the steps of: creating a corona charge with a corona discharge voltage; sensitizing thermoplastic material with the corona charge prior to each new recording cycle; progressively increasing the corona discharge voltage to increase the corona charge for sensitizing prior to each new recording cycle; holographically exposing the sensitized thermoplastic material; heating the exposed material to produce a surface relief; and fixing the surface relief by cooling the thermoplastic material.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |