US3528448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry valve
Assignee: Lunkenheimer Co
•
Filing: 1967-10-04
•
Granted: 1970-09-15
•
Expires: 1987-10-04
Abstract
No abstract record available.
Inventors
- 👤 John B Urban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:08
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/14; F16K5/20; F16K5/205; F16K5/208; F16K5/06; F16K5/0626; F16K5/0642; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4273; Y10T137/598; Y10T137/6031; Y10T137/6035; Y10T137/6048; Y10T137/6052; Y10T137/6055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2803426A
Cited
US2893682A
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US2974921A
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US3064940A
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US2988320A
Cited
US3077902A
Cited
US3076631A
Cited
US3181834A
Cited
US3260496A
Cited
US3339887A
Cited
US3284045A
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 |