US3959799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information storage by laser beam initiated reactions
Assignee: International Business Machines Corp
•
Filing: 1974-09-09
•
Granted: 1976-05-25
•
Expires: 1994-09-09
Abstract
Abstract There is disclosed herein a relatively low-cost, high density postable storage medium which comprises adjacent thin layers of two or more materials which react upon heating to form a reaction product with optical, magnetic or electrical properties different from the corresponding properties of the reactant materials. Thus, utilizing reactant layers such as aluminum and selenium, the heating results in a reaction product of Al 2 Se 3 . The heating agent is notably a laser beam.
Inventors
- 👤 Richard J. Gambino
- 👤 Frederic Holtzberg
- 👤 Ralph R. Ruf
- 👤 Benjamin Welber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:35
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11C; G11C13/00; G11C13/04; G11C13/048; G11B2007/24302; G11B2007/2431; G11B2007/24316; G11B7/252; G11B7/253; G11B7/2533; G11B7/2535; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A low threshold high density storage medium comprising adjacent thin layers of at least two materials which upon heating form a reaction product having optical, magnetic, or electrical properties different from the corresponding properties of said materials respectively said at least two materials being selected from the group consisting of Al, Se, Zn, Bi, As, Mn and In - Ga; and including a thin barrier layer intermediate said at least two material layers and comprising a substance different from said materials for preventing the spontaneous reaction of said materials in the absence of said heating; and wherein one of said at least two materials is intermediate double layers of said other material layers and said barrier layer.
Claim 2
Dependent Claim
117 words
A low threshold high density storage medium comprising adjacent thin layers of at least two materials which upon heating form a reaction product having optical, magnetic, or electrical properties different from the corresponding properties of said materials respectively said at least two materials being selected from the group consisting of Al, Se, Zn, Bi, As, Mn and In - Ga; and including a thin barrier layer intermediate said at least two material layers and comprising a substance different from said materials for preventing the spontaneous reaction of said materials in the absence of said heating; and wherein one of said at least two materials is intermediate double layers of said other material layers and said barrier layer.
References Cited (Backward Citations)
US3368209A
Cited
US3560994A
Cited
US3594167A
Cited
US3655256A
Cited
US3740761A
Cited
US3831179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |