US3533507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular filters backwash means
Assignee: Paterson Candy International Ltd
•
Filing: 1968-06-11
•
Granted: 1970-10-13
•
Expires: 1988-06-11
Abstract
No abstract record available.
Inventors
- 👤 Robert William Aitken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:12
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4631; B01D24/4636; B01D24/02; B01D24/20; B01D24/22; B01D2201/00; B01D2201/08; B01D2201/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |