Patent US3421777A successfully refreshed from Google Patents.
US3421777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dolly for semitrailer
Assignee: Utility Trailer Manufacturing Co
•
Filing: 1967-03-02
•
Granted: 1969-01-14
•
Expires: 1987-03-02
Abstract
No abstract record available.
Inventors
- 👤 Stephen Barker
- 👤 Paul F Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:57
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0857; B62D53/0864; B62D53/0871
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2330897A
Cited
US2714017A
Cited
DE901988C
Cited
US2762634A
Cited
US3151880A
Cited
US3151881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |