Patent US3508233A successfully refreshed from Google Patents.
US3508233A
Expired / Lapsed
US
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Combination of electrical lock system and fire alarm system
Assignee: HEIWA DENKI KK
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Filing: 1967-05-25
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Granted: 1970-04-21
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Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 Kazuo Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:50
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06; Y; Y10; Y10T; Y10T70/00; Y10T70/60; Y10T70/625; Y10T70/65; Y10T70/80; Y10T70/8946
Claims Analysis
Total Claims: 0
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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) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |