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US2520431A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1946-10-02
•
Granted: 1950-08-29
•
Expires: 1966-10-02
Abstract
No abstract record available.
Inventors
- 👤 Preston G Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:25
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/18; B66C23/36; B66C23/48; Y; Y10; Y10S; Y10S212/00; Y10S212/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US546088A
Cited
US1229507A
Cited
US1280660A
Cited
US1443376A
Cited
US1489161A
Cited
US1566827A
Cited
US2382054A
Cited
US2419813A
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 |