Patent US2809874A successfully refreshed from Google Patents.
US2809874A
Expired / Lapsed
US
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Safety latches
Assignee: Singer Co
•
Filing: 1953-05-11
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Granted: 1957-10-15
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Expires: 1973-05-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:15
CPC Classifications
D; D05; D05B; D05B75/00; D05B75/06; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/20714; Y10T74/2072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US70597A
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US103472A
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US140929A
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US683499A
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US1121713A
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US2001507A
Cited
GB502164A
Cited
US2409758A
Cited
US2477433A
Cited
CH252119A
Cited
US2631074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |