US1938746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for rendering fibrous materials noninflammable
Assignee: IG Farbenindustrie AG
•
Filing: 1931-01-13
•
Granted: 1933-12-12
•
Expires: 1951-01-13
Abstract
No abstract record available.
Inventors
- 👤 Engelhardt Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/63; D21H17/66; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H5/00; D21H5/0002; D21H23/00; D21H23/02; D21H23/22; D21H23/30; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T428/2933; Y10T428/294; Y10T428/296
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) | 1936-12-11 | 1937-06-12 | 1937-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-11 | 1941-06-12 | 1941-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-11 | 1945-06-12 | 1945-12-12 | $7700.00 | Window Closed / Lapsed |