US2823652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical coil heater
Assignee: MW Kellogg Co
•
Filing: 1954-11-30
•
Granted: 1958-02-18
•
Expires: 1974-11-30
Abstract
No abstract record available.
Inventors
- 👤 Charles K Mader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:41
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/22; F22B21/26; B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00083; B01J2219/0015; B01J2219/00155
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |