Patent US2520187A successfully refreshed from Google Patents.
US2520187A
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US
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Assignee: Individual
•
Filing: 1945-09-21
•
Granted: 1950-08-29
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Expires: 1965-09-21
Abstract
No abstract record available.
Inventors
- 👤 August E Wilshusen
- 👤 Wilshusen Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:39
CPC Classifications
B; B26; B26D; B26D7/00; B26D7/06; F; F04; F04B; F04B47/00; F04B47/02; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18152
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US295325A
Cited
USRE20287E
Cited
US1097333A
Cited
US1683006A
Cited
US1708577A
Cited
US2351183A
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 |