US2133329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat treating furnace linings
Assignee: PITTSBURGH RES CORP
•
Filing: 1936-09-01
•
Granted: 1938-10-18
•
Expires: 1956-09-01
Abstract
No abstract record available.
Inventors
- 👤 William E Moore
- 👤 William B Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
F; F27; F27D; F27D99/00; F27D99/0001; F27D99/0006; C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C03B5/43; F27D1/00; F27D1/16; F27B; F27B3/00; F27B3/10; F27B3/12; F27B2003/125; F27D2099/0015; F27D2099/0058; F27M; F27M2003/00; F27M2003/04; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-10-17 | 1942-04-18 | 1942-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-10-17 | 1946-04-18 | 1946-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-10-17 | 1950-04-18 | 1950-10-18 | $7700.00 | Window Closed / Lapsed |