US2709345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for defrosting refrigeration coils
Assignee: Worthington Corp
•
Filing: 1951-10-04
•
Granted: 1955-05-31
•
Expires: 1971-10-04
Abstract
No abstract record available.
Inventors
- 👤 Melvin A Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:24
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25D; F25D21/00; F25D21/002; F25D21/06; F25D21/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE19988E
Cited
US1970340A
Cited
US2452102A
Cited
US2459173A
Cited
US2511419A
Cited
US2554848A
Cited
US2526379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |