Patent US2664481A successfully refreshed from Google Patents.
US2664481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal relay and constant gap spacer
Assignee: Individual
•
Filing: 1951-11-14
•
Granted: 1953-12-29
•
Expires: 1971-11-14
Abstract
No abstract record available.
Inventors
- 👤 Harry A Pearl
- 👤 Rudner Merritt Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:23
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/46
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) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |