US3400520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter material for internal combustion engine air cleaner
Assignee: Denso Corp
•
Filing: 1967-04-24
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Granted: 1968-09-10
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Expires: 1987-04-24
Abstract
No abstract record available.
Inventors
- 👤 Sakurai Takasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:29
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0681
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2521984A
Cited
US2988168A
Cited
US2888095A
Cited
US2933154A
Cited
US3063787A
Cited
GB1018379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |