US3351131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Societe Grenobloise dEtudes et dApplications Hydrauliques SA SOGREAH
•
Filing: 1965-04-08
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Granted: 1967-11-07
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Expires: 1985-04-08
Abstract
No abstract record available.
Inventors
- 👤 Berthold Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:05
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/22; F28F2009/222; F28F2009/226; F28F9/02; F28F9/026; F28F9/0278; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1457941A
Cited
US1982010A
Cited
DE633132C
Cited
US2391244A
Cited
US2513124A
Cited
FR984248A
Cited
US2589730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |