US3403608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterproofing of porous silicious materials
Assignee: Ashland LLC
•
Filing: 1966-09-14
•
Granted: 1968-10-01
•
Expires: 1986-09-14
Abstract
No abstract record available.
Inventors
- 👤 Clarence N Impola
- 👤 Robert H Leitheiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/30; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/48; C04B41/488; C04B2111/00; C04B2111/00474; C04B2111/00732; C04B2111/0075; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3136732A
Cited
US3141304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |