US2764147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frictional heater for hydraulic system
Assignee: Northrop Grumman Corp
•
Filing: 1951-02-23
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Granted: 1956-09-25
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Expires: 1971-02-23
Abstract
No abstract record available.
Inventors
- 👤 Paul F Brunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/22; F; F15; F15B; F15B21/00; F15B21/04; F15B21/042; F15B21/0427; F24; F24V; F24V40/00; F24V40/10; F15B2211/00; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/40576; F15B2211/41; F15B2211/411; F15B2211/415; F15B2211/41563; F15B2211/60; F15B2211/62; F15B2211/63; F15B2211/6303; F15B2211/6343
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |