US3540309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front chain sprocket having a built-in automatic speed change mechanism
Assignee: Shimano Inc
•
Filing: 1968-11-20
•
Granted: 1970-11-17
•
Expires: 1988-11-20
Abstract
No abstract record available.
Inventors
- 👤 Keizo Shimano
- 👤 Masashi Nagano
- 👤 Kimihiro Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:38
CPC Classifications
B; B62; B62M; B62M11/00; B62M11/04; B62M11/14; B62M11/145; F; F16; F16H; F16H61/00; F16H61/02; F16H61/0293; F16H2718/00; F16H2718/08; F16H2718/10; F16H2718/12; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2164; Y10T74/2165
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |