US3458978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-planar filter and supporting means
Assignee: Davis Industrial Equipment Ltd
•
Filing: 1967-09-12
•
Granted: 1969-08-05
•
Expires: 1987-09-12
Abstract
No abstract record available.
Inventors
- 👤 Maurice Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:02
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; B01D46/0002; B01D46/0005; B01D46/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1056108A
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US1830096A
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US2074294A
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US2211382A
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US2135863A
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US2502560A
Cited
US2739667A
Cited
US3227592A
Cited
US3177637A
Cited
US3183286A
Cited
US3222580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |