US3406267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity switch having a magnetic shield
Assignee: Jervis B Webb Co
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Filing: 1966-08-23
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Granted: 1968-10-15
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Expires: 1986-08-23
Abstract
No abstract record available.
Inventors
- 👤 James P Kohls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:54
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/23; H01; H01H; H01H36/00; H01H36/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A MAGNETIC PROXIMITY SWITCH INCLUDING A NON-MAGNETIC CASE HAVING A SENSING FACE AND A SWITCH ELEMENT WITH A PAIR OF MAGNETICALLY OPEARBLE CONTACTS MOUNTED IN A SENSING MAGNETIC FIELD AND IN A BIASING MAGNETIC FIELD; CHARACTERIZED BY THE SENSING MAGNETIC FIELD BEING FORMED BY A PAIR OF SENSING MAGNETS MOUNTED IN THE CASE IN SPACED RELATION TO EACH OTHER WITH ONE PAIR OF OPPOSITE POLES ADJACENT THE SENSING FACE, THE MAGNETICALLY OPERABLE CONTACTS OF THE SWITCH ELEMENT BEING MOUNTED IN THE FIELD BETWEEN THE OTHER PAIR OF OPPOSITE POLES; THE BIASING MAGNETIC FIELD BEING FORMED BY A PAIR OF BIASING MAGNETS POSITIONED IN THE CASE WITH ONE PAIR OF OPPOSITE POLES ADJACENT THE MAGNETICALLY OPERABLE CONTACTS OF THE SWITCH ELEMENT; A SHIELD MEMBER OF MAGNETIC MATERIAL MOUNTED IN THE CASE TO FORM A CLOSED FLUX PATH FOR THE SENSING AND BIASING MAGNETIC FIELDS, WHICH CLOSED FLUX PATH IS SPACED FROM THE SENSING FACE AND SHIELDS BOTH THE SENSING AND BIASING MAGNETIC FIELDS FROM THE INFLUENCE OF EXTRANEOUS MAGNETIC MATERIAL OTHER THAN MAGNETIC MATERIAL TO BE DETECTED ADJACENT THE SENSING FACE OF THE CASE.
Claim 2
Dependent Claim
183 words
A MAGNETIC PROXIMITY SWITCH INCLUDING A NON-MAGNETIC CASE HAVING A SENSING FACE AND A SWITCH ELEMENT WITH A PAIR OF MAGNETICALLY OPEARBLE CONTACTS MOUNTED IN A SENSING MAGNETIC FIELD AND IN A BIASING MAGNETIC FIELD; CHARACTERIZED BY THE SENSING MAGNETIC FIELD BEING FORMED BY A PAIR OF SENSING MAGNETS MOUNTED IN THE CASE IN SPACED RELATION TO EACH OTHER WITH ONE PAIR OF OPPOSITE POLES ADJACENT THE SENSING FACE, THE MAGNETICALLY OPERABLE CONTACTS OF THE SWITCH ELEMENT BEING MOUNTED IN THE FIELD BETWEEN THE OTHER PAIR OF OPPOSITE POLES; THE BIASING MAGNETIC FIELD BEING FORMED BY A PAIR OF BIASING MAGNETS POSITIONED IN THE CASE WITH ONE PAIR OF OPPOSITE POLES ADJACENT THE MAGNETICALLY OPERABLE CONTACTS OF THE SWITCH ELEMENT; A SHIELD MEMBER OF MAGNETIC MATERIAL MOUNTED IN THE CASE TO FORM A CLOSED FLUX PATH FOR THE SENSING AND BIASING MAGNETIC FIELDS, WHICH CLOSED FLUX PATH IS SPACED FROM THE SENSING FACE AND SHIELDS BOTH THE SENSING AND BIASING MAGNETIC FIELDS FROM THE INFLUENCE OF EXTRANEOUS MAGNETIC MATERIAL OTHER THAN MAGNETIC MATERIAL TO BE DETECTED ADJACENT THE SENSING FACE OF THE CASE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |