US2761526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Waagner Biro AG
•
Filing: 1953-08-14
•
Granted: 1956-09-04
•
Expires: 1973-08-14
Abstract
No abstract record available.
Inventors
- 👤 Kemmetmuller Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/01; B; B04; B04C; B04C5/00; B04C5/20; F28D; F28D7/00; F28D7/16; F28D7/1615; F28D7/1623; F28F13/00; F28F13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US983914A
Cited
US1775103A
Cited
GB336755A
Cited
US1916337A
Cited
CH166907A
Cited
US2327691A
Cited
US2355621A
Cited
US2417661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |