US3446571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impregnating porous inert bodies,prolonging water evaporation of land surfaced water bodies therewith,and products therefor
Assignee: Individual
•
Filing: 1964-12-07
•
Granted: 1969-05-27
•
Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 Alton V Oberholtzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:42
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/06; E04H4/10; B; B01; B01J; B01J19/00; B01J19/16; C; C02; C02F; C02F1/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |