US3493040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Davidson Maxwell Evaporators Ltd
•
Filing: 1967-10-17
•
Granted: 1970-02-03
•
Expires: 1987-10-17
Abstract
No abstract record available.
Inventors
- 👤 Maxwell Wingate Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/08; F; F28; F28D; F28D3/00; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y10; Y10S; Y10S165/00; Y10S165/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3356125A
Cited
US3351119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |