Patent US4045974A successfully refreshed from Google Patents.
US2621998A
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Door opening detector device
Assignee: Individual
•
Filing: 1949-10-12
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Granted: 1952-12-16
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Expires: 1969-10-12
Abstract
No abstract record available.
Inventors
- 👤 Edward B Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:42
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US504741A
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US1657691A
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US713325A
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US922633A
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US1162837A
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US1247737A
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US1437001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |