US2530356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High vacuums
Assignee: Dow Chemical Co
•
Filing: 1945-06-13
•
Granted: 1950-11-14
•
Expires: 1965-06-13
Abstract
No abstract record available.
Inventors
- 👤 Melvin J Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:38
CPC Classifications
F; F04; F04F; F04F9/00; C; C09; C09K; C09K3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1857508A
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US2265962A
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US2147488A
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US2258222A
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US2371050A
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US2398187A
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US2457677A
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US2449940A
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US2469889A
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US2444555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |