Patent US2689975A successfully refreshed from Google Patents.
US2689975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for producing building boards
Assignee: Individual
•
Filing: 1952-01-15
•
Granted: 1954-09-28
•
Expires: 1972-01-15
Abstract
No abstract record available.
Inventors
- 👤 Leng Franz Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:51
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52; B28B1/525; Y; Y10; Y10S; Y10S264/00; Y10S264/57; Y10S425/00; Y10S425/054
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US230880A
Cited
US2328058A
Cited
US2377484A
Cited
US2285098A
Cited
US2445415A
Cited
US2544019A
Cited
US2445210A
Cited
US2446782A
Cited
US2583618A
Cited
US2583249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |