US3036812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valves
Assignee: Dewrance and Co Ltd
•
Filing: 1958-11-19
•
Granted: 1962-05-29
•
Expires: 1978-11-19
Abstract
No abstract record available.
Inventors
- 👤 Wierzbicki Alexander
- 👤 Jozef J Haftke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901961A
Cited
US2442625A
Cited
GB654449A
Cited
GB674771A
Cited
DE908813C
Cited
US2789785A
Cited
US2883147A
Cited
FR1155199A
Cited
DE1026587B
Cited
US2923522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |