US3649936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature switch
Assignee: Denso Corp
•
Filing: 1970-07-09
•
Granted: 1972-03-14
•
Expires: 1990-07-09
Abstract
Abstract A temperature switch in which a reed switch connected to an alarming device is disposed in a magnetic circuit of a permanent magnet and two parts or pieces of magnetic substances having different magnetic transition points are magnetically arranged in series with the permanent magnet, thereby the alarming device being actuated by switching on and off the reed switch in accordance with the change in the permeability of the parts of magnetic substance with respect to the temperature variation and thus abnormal rise and drop of the of objects to be measured can be directly detected.
Inventors
- 👤 Mitsuo Masuda
- 👤 Nobuyoshi Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:22
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/58; H01H37/585; C; C23; C23G; C23G1/00; C23G1/02; C25; C25D; C25D5/00; C25D5/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A temperature switch comprising: a reed switch (7) having first and second closing positions and an opening position, a permanent magnet (8) and, two pieces (9a, 9b) of magnetic substances having two different magnetic transition points, said permanent magnet and said two pieces of magnetic substances being arranged in series with each other so that said permanent magnet is positioned on the first closing position of said reed switch, the one piece (9a) having the lower magnetic transition point being positioned on the second closing position of said switch and the other piece (9b) being positioned on the opening position of said reed switch to cause said reed switch to be switchable on and off at two different temperatures substantially corresponding to said different magnetic transition points of said two pieces of magnetic substances.
Claim 2
Dependent Claim
134 words
A temperature switch comprising: a reed switch (7) having first and second closing positions and an opening position, a permanent magnet (8) and, two pieces (9a, 9b) of magnetic substances having two different magnetic transition points, said permanent magnet and said two pieces of magnetic substances being arranged in series with each other so that said permanent magnet is positioned on the first closing position of said reed switch, the one piece (9a) having the lower magnetic transition point being positioned on the second closing position of said switch and the other piece (9b) being positioned on the opening position of said reed switch to cause said reed switch to be switchable on and off at two different temperatures substantially corresponding to said different magnetic transition points of said two pieces of magnetic substances.
References Cited (Backward Citations)
US3295081A
Cited
FR1549349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |