US2452200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of porous material
Assignee: EIDP Inc
•
Filing: 1945-04-16
•
Granted: 1948-10-26
•
Expires: 1965-04-16
Abstract
No abstract record available.
Inventors
- 👤 Hamline M Kvalnes
- 👤 Franklin S Chance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:49
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/15; C; C08; C08L; C08L97/00; C08L97/02; C08L61/00; C08L61/20; C08L61/22; C08L61/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1650274A
Cited
US2192129A
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US2056458A
Cited
US2150697A
Cited
US2203641A
Cited
US2373135A
Cited
US2374647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |