US3716103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprinkler head
Assignee: Senju Metal Industry Co Ltd
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Filing: 1971-07-06
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Granted: 1973-02-13
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Expires: 1991-07-06
Abstract
Abstract THE PRESENT INVENTION IS DIRECTED TO A SPRINKLER HEAD FOR AUTOMATICALLY DISCHARGING FIRE EXTINGUISHING FLUID IMMEDIATELY IN RESPONSE TO HEAT GENERATED BY A FIRE OR THE LIKE. THE SPRINKLER HEAD INCLUDES A COLLAPSIBLE HEAT SENSITIVE ASSEMBLY IN WHICH A PAIR OF LEVERS ARE PROVIDED TO CARRY A PACKING SUPPORT AND A CYLINDER FILLED WITH A LOW MELTING METAL, WITH THE PACKING SUPPORT BEING HELD IN CONTACT WITH THE CYLINDER, AND WHEREIN A SUPPORT PLATE FOR SUPPORTING THE LEVERS IS OUTWARDLY DISPLACED TO ALLOW THE PACKING SUPPORT TO FALL DOWN ON THE OPENING OF A DEFLECTOR USED AS COVER WHEN THE METAL IS MELTED AND FLOWS. D R A W I N G
Inventors
- 👤 J Tanaka
- 👤 H Onuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
B; B05; B05B; B05B1/00; B05B1/26; B05B1/262; B05B1/265; A; A62; A62C; A62C37/00; A62C37/08; A62C37/10; A62C37/11; A62C37/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |