Patent JPS60110171A successfully refreshed from Google Patents.
US4370568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting, fast rise-time voltage source
Assignee: AT&T Inc
•
Filing: 1979-12-10
•
Granted: 1983-01-25
•
Expires: 1999-12-10
Abstract
Abstract A pulse generator comprises a toroid (11) of a superconducting material such as Niobium on a glass or ceramic substrate (12). A cryogenic source such as liquid helium cools the toroid to within a few degrees of absolute zero and a perpetually circulatory current is set up in the toroid. A laser beam is fired at the toroid to cause localized heating and the resultant current drop due to the material resistance causes an output pulse to be induced in an adjacent current winding (14).
Inventors
- 👤 Robert M. Lumley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:15
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/38; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/856; Y10S505/857; Y10S505/863
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
Apparatus for generating an electrical pulse having an extremely short rise-time comprising: an electrically conducting toroid; means for cooling said toroid to approximately absolute zero, whereupon said toroid becomes superconducting; means, magnetically coupled to said toroid, for inducing a perpetually circulating current in said toroid; means for heating a portion of said toroid to a temperature above the critical temperature thereof; and means, magnetically coupled to said toroid, for sensing the abrupt drop in the circulating current that occurs therein when said critical temperature is exceeded, wherein said toroid, said current inducing means, and said current sensing means comprise coplanar, coaxial, thin metallic films deposited on a substrate.
Claim 2
Dependent Claim
108 words
Apparatus for generating an electrical pulse having an extremely short rise-time comprising: an electrically conducting toroid; means for cooling said toroid to approximately absolute zero, whereupon said toroid becomes superconducting; means, magnetically coupled to said toroid, for inducing a perpetually circulating current in said toroid; means for heating a portion of said toroid to a temperature above the critical temperature thereof; and means, magnetically coupled to said toroid, for sensing the abrupt drop in the circulating current that occurs therein when said critical temperature is exceeded, wherein said toroid, said current inducing means, and said current sensing means comprise coplanar, coaxial, thin metallic films deposited on a substrate.
Claim 3
Dependent Claim
39 words
The apparatus according to claim 1 wherein said cooling means comprise: a source of a cryogenic liquid; and means positioned on the back surface of said substrate for circulating said liquid proximate the toroid, thereby to cool the same.
Claim 4
Dependent Claim
32 words
The apparatus according to claim 1 wherein said current inducing means comprises: a current coil; a current source; and means for completing a circuit between said current source and said current coil.
Claim 5
Dependent Claim
76 words
Apparatus for generating an electrical pulse having an extremely short rise-time which comprises: an electrically non-conductive substrate; a thin film of superconducting material deposited on said substrate, said film being in the shape of a toroid; a current inducing coil comprising a thin, circular film of conductive material deposited on said substrate, coaxial with said toroid; and an output coil comprising a thin, circular film of conductive material deposited on said substrate, coaxial with said toroid.
Claim 6
Dependent Claim
76 words
Apparatus for generating an electrical pulse having an extremely short rise-time which comprises: an electrically non-conductive substrate; a thin film of superconducting material deposited on said substrate, said film being in the shape of a toroid; a current inducing coil comprising a thin, circular film of conductive material deposited on said substrate, coaxial with said toroid; and an output coil comprising a thin, circular film of conductive material deposited on said substrate, coaxial with said toroid.
Claim 7
Dependent Claim
91 words
Apparatus for generating an electrical pulse having an extremely short rise-time comprising: an electrically conducting toroid; means for cooling said toroid to approximately absolute zero, whereupon said toroid becomes superconducting; means, magnetically coupled to said toroid, for inducing a perpetually circulating current in said toroid; means for heating a portion of said toroid to a temperature above the critical temperature thereof; and means comprising a thin film coil magnetically coupled to said toroid, for sensing the abrupt drop in the circulating current that occurs therein when said critical temperature is exceeded.
Claim 8
Dependent Claim
91 words
Apparatus for generating an electrical pulse having an extremely short rise-time comprising: an electrically conducting toroid; means for cooling said toroid to approximately absolute zero, whereupon said toroid becomes superconducting; means, magnetically coupled to said toroid, for inducing a perpetually circulating current in said toroid; means for heating a portion of said toroid to a temperature above the critical temperature thereof; and means comprising a thin film coil magnetically coupled to said toroid, for sensing the abrupt drop in the circulating current that occurs therein when said critical temperature is exceeded.
Claim 9
Dependent Claim
114 words
Apparatus for generating an electrical pulse having an extremely short rise-time comprising: an electrically conducting toroid; means for cooling said toroid to approximately absolute zero, whereupon said toroid becomes superconducting; means, magnetically coupled to said toroid, for inducing a perpetually circulating current in said toroid; means for heating a portion of said toroid to a temperature above the critical temperature thereof, said heating means including a laser, means for focusing the optical output from said laser onto a portion of said toroid, and means for selectively energizing said laser; and means, magnetically coupled to said toroid, for sensing the abrupt drop in the circulating current that occurs therein when said critical temperature is exceeded.
Claim 10
Dependent Claim
114 words
Apparatus for generating an electrical pulse having an extremely short rise-time comprising: an electrically conducting toroid; means for cooling said toroid to approximately absolute zero, whereupon said toroid becomes superconducting; means, magnetically coupled to said toroid, for inducing a perpetually circulating current in said toroid; means for heating a portion of said toroid to a temperature above the critical temperature thereof, said heating means including a laser, means for focusing the optical output from said laser onto a portion of said toroid, and means for selectively energizing said laser; and means, magnetically coupled to said toroid, for sensing the abrupt drop in the circulating current that occurs therein when said critical temperature is exceeded.
References Cited (Backward Citations)
US3271592A
Cited
US3360678A
Cited
US3956727A
Cited
US3983419A
Cited
US4140917A
Cited
US4168441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |