Patent US3420540A successfully refreshed from Google Patents.
US3420540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shopping cart with endless belt stair climbing means
Assignee: Individual
•
Filing: 1966-10-06
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Granted: 1969-01-07
•
Expires: 1986-10-06
Abstract
No abstract record available.
Inventors
- 👤 William Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:20
CPC Classifications
B; B62; B62B; B62B5/00; B62B5/02; B62B2301/00; B62B2301/25; B62B2301/256
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1554034A
Cited
US2132069A
Cited
US2214311A
Cited
US2468604A
Cited
US2920900A
Cited
US3092200A
Cited
US3104113A
Cited
US3370664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |