US2744295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction duct system for variable drafting heads
Assignee: Warner and Swasey Co
•
Filing: 1953-02-18
•
Granted: 1956-05-08
•
Expires: 1973-02-18
Abstract
No abstract record available.
Inventors
- 👤 Andrew A Spisak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:00
CPC Classifications
D; D01; D01H; D01H5/00; D01H5/18; D01H5/60; D01H5/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2147190A
Cited
US2487361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |