US3513908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Embedded tube heat exchanger
Assignee: GURU B SINGH
•
Filing: 1967-08-18
•
Granted: 1970-05-26
•
Expires: 1987-08-18
Abstract
No abstract record available.
Inventors
- 👤 Guru B Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:31
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/024; F28F; F28F1/00; F28F1/10; F28F1/40; F28F13/00; F28F2255/00; F28F2255/18; F28F2275/00; F28F2275/02; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB219329A
Cited
US2061742A
Cited
GB486248A
Cited
US2960114A
Cited
GB1035405A
Cited
US3289756A
Cited
US3306352A
Cited
US3359753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |