Patent US2565724A successfully refreshed from Google Patents.
US2565724A
Expired / Lapsed
US
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Perspective drafting machine
Assignee: Boeing Co
•
Filing: 1945-02-05
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Granted: 1951-08-28
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Expires: 1965-02-05
Abstract
No abstract record available.
Inventors
- 👤 Clair C Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:43
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/14; B43L13/141
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US838799A
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US1286525A
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US1586067A
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US2049302A
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US2364153A
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US2413376A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |