US2931469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting tray assembly
Assignee: Shell USA Inc
•
Filing: 1956-04-16
•
Granted: 1960-04-05
•
Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Iglehart Richard Lannert
- 👤 Jack R Sowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:51
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/324; B01D3/326; B01D3/16; B01D3/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1604875A
Cited
USRE22946E
Cited
US2231297A
Cited
US2375409A
Cited
US2374550A
Cited
US2582826A
Cited
US2619337A
Cited
US2710678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |