US3516647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-air pollution device
Assignee: Johnson March Corp
•
Filing: 1967-07-11
•
Granted: 1970-06-23
•
Expires: 1987-07-11
Abstract
No abstract record available.
Inventors
- 👤 Sam Jaffe
- 👤 Gregory L Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/02; B01D47/021; B01D47/028
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1049988A
Cited
US1708656A
Cited
US2022740A
Cited
US2006927A
Cited
US2083649A
Cited
US2385077A
Cited
US2468934A
Cited
US2608399A
Cited
DE907264C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |