US3918904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlling evaporation of water
Assignee: ChampionX LLC
•
Filing: 1974-03-28
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Granted: 1975-11-11
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Expires: 1994-03-28
Abstract
Abstract Retarding the rate of water evaporation by adding to the body of water a water-soluble vinyl addition polymer in the form of acrylamide sodium acrylate copolymer.
Inventors
- 👤 Joseph F Vartiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
A METHOD OF RETARDING EVAPORATION OF A BODY OF WATER TO A PREDETERMINED RATE BY ADDING TO THE BODY OF WATER A WATER SOLUBLE VINYL ADDITION POLYMER IN THE FORM OF ACRYLAMIDE SODIUM ACRYLATE COPLYMER IN AN AMOUNT SUFFCIENT TO RETARD EVAPRATION TO SAID RATE.
Claim 2
Independent Claim
45 words
A METHOD OF RETARDING EVAPORATION OF A BODY OF WATER TO A PREDETERMINED RATE BY ADDING TO THE BODY OF WATER A WATER SOLUBLE VINYL ADDITION POLYMER IN THE FORM OF ACRYLAMIDE SODIUM ACRYLATE COPLYMER IN AN AMOUNT SUFFCIENT TO RETARD EVAPRATION TO SAID RATE.
Claim 3
Dependent Claim
23 words
A method according to claim 1 where the polymer is itself dissolved in water prior to being added to the body of water.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |