US2556854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic coupling drive for highpressure stirred reactors
Assignee: Standard Oil Development Co
•
Filing: 1949-10-29
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Granted: 1951-06-12
•
Expires: 1969-10-29
Abstract
No abstract record available.
Inventors
- 👤 Harry E Spears
- 👤 Mayer Ivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/108; B; B01; B01F; B01F33/00; B01F33/45; B01F33/453; B01F33/4531; H02K5/00; H02K5/04; H02K5/12; H02K5/128
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |