Patent US3549173A successfully refreshed from Google Patents.
US3549173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety trailer device
Assignee: HARRY M STANFIELD
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Filing: 1969-01-29
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Granted: 1970-12-22
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Expires: 1989-01-29
Abstract
No abstract record available.
Inventors
- 👤 Harry M Stanfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:48
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/01; B60D1/06; B60D1/065; B60D1/24; B60D1/28; B60D1/36; B60D1/38; B60D1/58; B60D1/583
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |