Patent US2997869A successfully refreshed from Google Patents.
US2997869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic heating device
Assignee: Individual
•
Filing: 1954-07-27
•
Granted: 1961-08-29
•
Expires: 1974-07-27
Abstract
No abstract record available.
Inventors
- 👤 Weiss Gerhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:28
CPC Classifications
F; F23; F23Q; F23Q2/00; F23Q2/30; B; B23; B23K; B23K1/00; D; D06; D06F; D06F75/00; D06F75/02; F23D; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0057; F23D2206/0063
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2291657A
Cited
US1326767A
Cited
US2036885A
Cited
GB191403984A
Cited
US657004A
Cited
US1050536A
Cited
US1353314A
Cited
US1577188A
Cited
US1906335A
Cited
US2014014A
Cited
US2487065A
Cited
US2419272A
Cited
US2701459A
Cited
US2617774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |