US3528447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tandem ball valve assembly with purging and leak sensing means
Assignee: ACF Industries Inc
•
Filing: 1969-02-10
•
Granted: 1970-09-15
•
Expires: 1989-02-10
Abstract
No abstract record available.
Inventors
- 👤 John P Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
F; F16; F16K; F16K35/00; F16K35/14; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4259; Y10T137/8158; Y10T137/8593; Y10T137/87917; Y10T137/87925; Y10T137/87981
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2200310A
Cited
US2430122A
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US3075552A
Cited
US2930576A
Cited
US2982305A
Cited
US3398761A
Cited
US3439897A
Cited
US3428366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |