US3309847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering means for a heat exchanger
Assignee: Borg Warner Corp
•
Filing: 1964-09-23
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Granted: 1967-03-21
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Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Desmond M Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:46
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/12; B; B60; B60K; B60K11/00; B60K11/02; B60K11/04; F28; F28F; F28F19/00; F28F19/01; F28D; F28D21/00; F28D2021/0019; F28D2021/008; F28D2021/0091; F28D2021/0094
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR553540A
Cited
US1589766A
Cited
DE507518C
Cited
US1814428A
Cited
US1860697A
Cited
US2455734A
Cited
US2639780A
Cited
US2752003A
Cited
US2854086A
Cited
US3002585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |