US2533697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction box
Assignee: Sir Joseph W Isherwood & Co Lt
•
Filing: 1948-11-22
•
Granted: 1950-12-12
•
Expires: 1968-11-22
Abstract
No abstract record available.
Inventors
- 👤 John W Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:34
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/1037; Y; Y10; Y10T; Y10T137/00; Y10T137/2713; Y10T137/2829; Y10T137/9682
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |