Patent US3796526A successfully refreshed from Google Patents.
US2981819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater construction for kiln or other apparatus
Assignee: —
•
Filing: —
•
Granted: 1961-04-25
•
Expires: 1978-04-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:34
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/44; C23C16/48; C23C16/481; H; H05; H05B; H05B3/00; H05B3/0033; H05B3/0038; H05B3/0071; H05B3/40; H05B3/42; H05B3/44; H05B2203/00; H05B2203/032
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US714373A
Cited
US764994A
Cited
US1231196A
Cited
US1802001A
Cited
US1905811A
Cited
GB338816A
Cited
US2131484A
Cited
GB484199A
Cited
DE892950C
Cited
US2400056A
Cited
US2358718A
Cited
US2439005A
Cited
US2504516A
Cited
US2497676A
Cited
CH256197A
Cited
US2599029A
Cited
US2627014A
Cited
US2707745A
Cited
US2764664A
Cited
US2822458A
Cited
US2844699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |