US2257239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving fibrous materials
Assignee: GAF Chemicals Corp
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Filing: 1938-11-07
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Granted: 1941-09-30
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Expires: 1958-11-07
Abstract
No abstract record available.
Inventors
- 👤 Krzikalla Hans
- 👤 Armbruster Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:21
CPC Classifications
C; C14; C14C; C14C9/00; C14C9/04; C14C3/00; C14C3/02; D; D06; D06M; D06M13/00; D06M13/322; D06M13/325; D06M13/328; D06M13/46; D06M13/463; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/56; D06P1/64; D06P1/651; D06P1/65106; D06P3/00; D06P3/02; D06P3/04; D06P3/32
Claims Analysis
Total Claims: 0
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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) | 1944-09-29 | 1945-03-31 | 1945-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-29 | 1949-03-31 | 1949-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-29 | 1953-03-31 | 1953-09-30 | $7700.00 | Window Closed / Lapsed |