US3386774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valves for feeding articles into pneumatic conveyance systems
Assignee: Tobacco Res & Dev I Ltd
•
Filing: 1966-06-13
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Granted: 1968-06-04
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Expires: 1986-06-13
Abstract
No abstract record available.
Inventors
- 👤 Mauritz L Strydom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:55
CPC Classifications
A; A24; A24C; A24C5/00; A24C5/32; A24C5/322; A24C5/323; B; B65; B65G; B65G51/00; B65G51/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US936951A
Cited
US3009744A
Cited
US3130879A
Cited
US3189178A
Cited
US3231314A
Cited
US3272396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |