Patent US3631809A successfully refreshed from Google Patents.
US3631809A
Expired / Lapsed
US
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Linear induction motor bail
Assignee: Tracked Hovercraft Ltd
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Filing: 1969-06-13
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Granted: 1972-01-04
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Expires: 1989-06-13
Abstract
Abstract A rail for a linear induction motor is formed of nonmagnetic manganese steel alloy which is found to satisfy the requirements for a good linear motor rail. In particular it has a sufficient resistivity to produce a high starting thrust and is hard enough for the application of friction brakes. The rail is shown used for a high-speed tracked air cushion vehicle.
Inventors
- 👤 Albert Benjamin John Reece
- 👤 Harry Rodney Heap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:19
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
32 words
A linear induction motor reaction rail adapted to carry induced electrical currents formed at least in part of a conductive, substantially nonmagnetic manganese steel alloy containing from 8 to 20 percent manganese.
Claim 2
Dependent Claim
32 words
A linear induction motor reaction rail adapted to carry induced electrical currents formed at least in part of a conductive, substantially nonmagnetic manganese steel alloy containing from 8 to 20 percent manganese.
Claim 3
Dependent Claim
30 words
A rail as claimed in claim 1 in combination with a track for a track-guided vehicle, the rail extending along at least a part of the length of the track.
Claim 4
Dependent Claim
68 words
A track for a track-guided vehicle having a linear induction motor reaction rail adapted to carry induced electrical currents formed of a conductive, substantially nonmagnetic manganese steel alloy containing from 8 to 20 percent manganese extending along at least a part of its length, in combination with a track-guided vehicle for travelling along said track, said vehicle including a linear induction motor stator for cooperating with said rail.
Claim 5
Dependent Claim
68 words
A track for a track-guided vehicle having a linear induction motor reaction rail adapted to carry induced electrical currents formed of a conductive, substantially nonmagnetic manganese steel alloy containing from 8 to 20 percent manganese extending along at least a part of its length, in combination with a track-guided vehicle for travelling along said track, said vehicle including a linear induction motor stator for cooperating with said rail.
Claim 6
Dependent Claim
25 words
The combination of a vehicle and a track as claimed in claim 3 in which the vehicle includes a friction brake to engage said rail.
Claim 7
Dependent Claim
20 words
A rail as claimed in claim 1 in which the manganese steel alloy contains from 11 to 14 percent manganese.
References Cited (Backward Citations)
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Cited
US2400192A
Cited
US2405012A
Cited
US3356041A
Cited
US3233559A
Cited
US3385228A
Cited
US3465181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |