US2543520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: AMPRO CORP
•
Filing: 1945-07-06
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Granted: 1951-02-27
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Expires: 1965-07-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Bradford
- 👤 Thomas I Ress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:57
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE173109C
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US77300A
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US598938A
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US1035872A
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US2136746A
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US2335326A
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US2298413A
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US2298369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |