Patent US2168900A successfully refreshed from Google Patents.
Patent US4050066A successfully refreshed from Google Patents.
US4050066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buzzer
Assignee: Seikosha KK
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Filing: 1976-10-06
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Granted: 1977-09-20
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Expires: 1996-10-06
Abstract
Abstract A buzzer comprises an annular magnet, a coil disposed at the inside of the magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil and with its one end facing said vibration plate, a case and a yoke. Said magnet said vibration plate and said yoke are held by the magnetic attraction of the magnet.
Inventors
- 👤 Takeshi Yanagisawa
- 👤 Motoyuki Osuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:37
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/02; H02K33/04; H02K33/06; G; G10; G10K; G10K9/00; G10K9/12; G10K9/13; G10K9/18; G10K9/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A buzzer comprising; an annular magnet, a coil disposed at the inside of said magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil with its one end facing said vibration plate, yoke and a case, wherein said magnet, said vibration plate and said yoke are held one another by magnetic attraction of said magnet.
Claim 2
Dependent Claim
63 words
A buzzer comprising; an annular magnet, a coil disposed at the inside of said magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil with its one end facing said vibration plate, yoke and a case, wherein said magnet, said vibration plate and said yoke are held one another by magnetic attraction of said magnet.
Claim 3
Dependent Claim
24 words
A buzzer according to claim 1, in which said case being provided with ribs on its inside for preventing removal of the vibration plate.
Claim 4
Dependent Claim
86 words
A buzzer comprising; an annular magnet, a coil wound about a bobbin disposed at the inside of said magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil with its one end facing said vibration plate, a yoke and a case, wherein said magnet, said vibration plate and said yoke are held one another by magnetic attraction of said magnet, and said magnet being provided with step portion for holding peripheral portion of a flange of said bobbin.
Claim 5
Dependent Claim
86 words
A buzzer comprising; an annular magnet, a coil wound about a bobbin disposed at the inside of said magnet, a vibration plate disposed above said magnet, a core inserted into the central opening of said coil with its one end facing said vibration plate, a yoke and a case, wherein said magnet, said vibration plate and said yoke are held one another by magnetic attraction of said magnet, and said magnet being provided with step portion for holding peripheral portion of a flange of said bobbin.
Claim 6
Dependent Claim
24 words
A buzzer according to claim 3, in which said case being provided with ribs on its inside for preventing removal of the vibration plate.
References Cited (Backward Citations)
US3950744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |