US2575956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Train parallax computer
Assignee: Individual
•
Filing: 1948-04-27
•
Granted: 1951-11-20
•
Expires: 1968-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank L Hereford
- 👤 Jr Walter D Whitehead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
F; F41; F41G; F41G3/00; F41G3/005; G; G06; G06G; G06G7/00; G06G7/48; G06G7/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2428372A
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US2408081A
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US2414102A
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US2443624A
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US2429606A
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US2421560A
Cited
US2434274A
Cited
US2428800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |