US3528764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for retarding evaporation from water surfaces
Assignee: Research Corp
•
Filing: 1967-11-28
•
Granted: 1970-09-15
•
Expires: 1987-11-28
Abstract
No abstract record available.
Inventors
- 👤 Castle O Reiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:34
CPC Classifications
C; C02; C02F; C02F1/00; B; B01; B01J; B01J19/00; B01J19/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3127235A
Cited
US2563002A
Cited
US2797140A
Cited
US2878098A
Cited
US3036880A
Cited
US2903330A
Cited
GB898431A
Cited
US3184789A
Cited
US3199944A
Cited
US3425791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |