Patent US3447481A successfully refreshed from Google Patents.
US3447481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locomotor and rail apparatus therefor
Assignee: GORHAM UNIVERSAL Mfg CO Inc
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Filing: 1966-03-14
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Granted: 1969-06-03
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Expires: 1986-03-14
Abstract
No abstract record available.
Inventors
- 👤 Harold F Gorham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:58
CPC Classifications
B; B61; B61B; B61B13/00; B61B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US684327A
Cited
US1360097A
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US2622541A
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GB750138A
Cited
US3147714A
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US3092039A
Cited
US3143977A
Cited
US3234891A
Cited
US3111910A
Cited
US3152559A
Cited
US3245355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |