US3407252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing filters having a microporous layer attached thereto
Assignee: Pall Corp
•
Filing: 1967-05-11
•
Granted: 1968-10-22
•
Expires: 1987-05-11
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
- 👤 Cyril A Keedwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:13
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21
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) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |