US3626340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reed switch assembly employing a magnetic screen
Assignee: Creed and Co Ltd
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Filing: 1970-04-13
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Granted: 1971-12-07
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Expires: 1990-04-13
Abstract
Abstract A reed switch (for example, for a keyboard controlling a transmitter) is controlled by a reciprocable high-permeability collar which can be slid axially onto the reed to screen the latter from a stationary magnet. This achieves low crosstalk and permits high-packing density.
Inventors
- 👤 Frederick Percival Mason
- 👤 Vishwanath Bansal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:18
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/0006; H01H36/0013; H01H36/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A reed switch assembly comprising a plurality of reed contact units, a magnet system fixed relative to the contact units for closing their contacts, and a respective high permeability screen associated with each contact unit, each screen being formed as a hollow cylinder surrounding the associated contact unit, each screen being movable in a direction substantially parallel to the axis of its associated contact unit between a first position at which it screens the associated contacts from the magnetic field of the magnet system thereby allowing the contacts to remain open and a second position at which it allows the magnetic field to close the contacts.
Claim 2
Dependent Claim
106 words
A reed switch assembly comprising a plurality of reed contact units, a magnet system fixed relative to the contact units for closing their contacts, and a respective high permeability screen associated with each contact unit, each screen being formed as a hollow cylinder surrounding the associated contact unit, each screen being movable in a direction substantially parallel to the axis of its associated contact unit between a first position at which it screens the associated contacts from the magnetic field of the magnet system thereby allowing the contacts to remain open and a second position at which it allows the magnetic field to close the contacts.
References Cited (Backward Citations)
US3155792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |