US3475906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for aircraft air conditioning systems
Assignee: Entwicklungsring Sued GmbH
•
Filing: 1967-02-28
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Granted: 1969-11-04
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Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 Gero Otto Madelung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:03
CPC Classifications
B; B64; B64D; B64D13/00; F; F02; F02C; F02C6/00; F02C6/04; F02C6/06; F02C6/08; F02C7/00; F02C7/12; F02C7/14; F02K; F02K3/00; F02K3/08; F02K3/105; F02K3/115; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y02T50/50; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |