US3486467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freight transportation equipment for railway cars
Assignee: DAVID F COULSON
•
Filing: 1967-10-20
•
Granted: 1969-12-30
•
Expires: 1987-10-20
Abstract
No abstract record available.
Inventors
- 👤 David F Coulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:58
CPC Classifications
B; B61; B61D; B61D45/00; B61D45/001; B61D45/004; B61D45/005; B61D3/00; B61D3/16; B61D3/18; B61D3/182; B61D3/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3181480A
Cited
US3224384A
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US3168878A
Cited
US3189307A
Cited
US3261306A
Cited
US3234893A
Cited
US3347506A
Cited
US3358954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |