US1989340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recovering heat from waste water
Assignee: Individual
•
Filing: 1932-10-18
•
Granted: 1935-01-29
•
Expires: 1952-10-18
Abstract
No abstract record available.
Inventors
- 👤 Allan T Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:46
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0017; F28D7/00; F28D7/16; F28D7/163; F28D7/1638; F28D7/1646; F28F; F28F13/00; F28F13/06; F28F13/12; F28D21/0001; F28D21/0012; Y; Y02; Y02B; Y02B30/00; Y02B30/56; Y10; Y10S; Y10S165/00; Y10S165/092; Y10S165/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-01-28 | 1938-07-30 | 1939-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-28 | 1942-07-30 | 1943-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-28 | 1946-07-30 | 1947-01-29 | $7700.00 | Window Closed / Lapsed |