Patent US2787442A successfully refreshed from Google Patents.
Patent US3056247A successfully refreshed from Google Patents.
US3056247A
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Air filter
Assignee: Pfizer Inc
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Filing: 1959-03-26
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Granted: 1962-10-02
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Expires: 1979-03-26
Abstract
No abstract record available.
Inventors
- 👤 Pindzola Daniel
- 👤 Nazarewicz Walter
- 👤 Samuel C Beesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189923073A
Cited
US967212A
Cited
US1040914A
Cited
US1328088A
Cited
US1897372A
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US1963874A
Cited
US2210059A
Cited
US2630878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |