Patent US3543547A successfully refreshed from Google Patents.
US3543547A
Expired / Lapsed
US
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Manually unlocking device of electric lock
Assignee: HEIWA DENKI KK
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Filing: 1968-01-03
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Granted: 1970-12-01
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Expires: 1988-01-03
Abstract
No abstract record available.
Inventors
- 👤 Kazuo Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:17
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/0046; E05B47/0047; E05C; E05C3/00; E05C3/12; E05C3/16; E05C3/22; E05C3/24; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1075; Y10T292/1082; Y10T292/68; Y10T292/696; Y10T292/699; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |