Patent US2520459A successfully refreshed from Google Patents.
US2520459A
Expired / Lapsed
US
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Locking apparatus
Assignee: Northern Pump Co
•
Filing: 1944-12-26
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Granted: 1950-08-29
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Expires: 1964-12-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Dohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:48
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/24; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/957; Y10S411/958
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US591892A
Cited
US858714A
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US1049489A
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US975012A
Cited
US1427807A
Cited
US1616996A
Cited
US1882089A
Cited
US2371927A
Cited
US2400318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |