US3512421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe valve operator
Assignee: ACF Industries Inc
•
Filing: 1966-09-02
•
Granted: 1970-05-19
•
Expires: 1986-09-02
Abstract
No abstract record available.
Inventors
- 👤 Clifford E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:13
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/04; F16K31/05; Y; Y10; Y10T; Y10T74/00; Y10T74/11; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18592
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3309942A
Cited
US3324741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |