Patent US2427989A successfully refreshed from Google Patents.
US2427989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile
Assignee: Individual
•
Filing: 1942-08-19
•
Granted: 1947-09-23
•
Expires: 1962-08-19
Abstract
No abstract record available.
Inventors
- 👤 George W Blackinton
- 👤 John J Calhoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:16
CPC Classifications
F; F42; F42B; F42B30/00; F42B30/04; F42B12/00; F42B12/02; F42B12/04; F42B12/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US14460A
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US103589A
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FR381577A
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US940527A
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GB191128030A
Cited
GB191415941A
Cited
GB191503091A
Cited
FR502754A
Cited
US1335406A
Cited
US1409045A
Cited
US1900790A
Cited
US2145507A
Cited
US2108818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |