US2600820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing scale from heating coils
Assignee: Individual
•
Filing: 1950-07-03
•
Granted: 1952-06-17
•
Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 William T Whatley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:09
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/042; F; F28; F28G; F28G5/00; Y; Y10; Y10S; Y10S159/00; Y10S159/13; Y10S159/90
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) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |