US2711307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting tray construction
Assignee: Shell Development Co
•
Filing: 1952-04-21
•
Granted: 1955-06-21
•
Expires: 1972-04-21
Abstract
No abstract record available.
Inventors
- 👤 Oswald H Milmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:41
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/324; B01D3/326; B01D3/16; B01D3/18; B01D3/328
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |