US3230919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing hydrodynamic drag of objects moving through water
Assignee: Western Company of North America
•
Filing: 1961-07-06
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Granted: 1966-01-25
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Expires: 1981-07-06
Abstract
No abstract record available.
Inventors
- 👤 Horace R Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:17
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/32; B63B1/34; B63B1/38; Y; Y02; Y02T; Y02T70/00; Y02T70/10; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF INCREASING THE SPEED THROUGH WATER OF AN OBJECT, WHICH COMPRISES INTRODUCING INTO THE WATER THROUGH WHICH AT LEAST A PORTION OF THE OBJECT MUST TRAVEL, A SHEAR-THINNING AGENT WHICH IS A WATER-SOLUBLE POLYMER, AND CONTROLLING THE FLOW OF THE AGENT INTO THE WATER TO PROVIDE ONLY A THIN SHEAR-THINNING LAYER OF SAID WATER-SOLUBLE POLYMER BETWEEN THE OBJECT AND THE WATER.
Claim 2
Independent Claim
63 words
A METHOD OF INCREASING THE SPEED THROUGH WATER OF AN OBJECT, WHICH COMPRISES INTRODUCING INTO THE WATER THROUGH WHICH AT LEAST A PORTION OF THE OBJECT MUST TRAVEL, A SHEAR-THINNING AGENT WHICH IS A WATER-SOLUBLE POLYMER, AND CONTROLLING THE FLOW OF THE AGENT INTO THE WATER TO PROVIDE ONLY A THIN SHEAR-THINNING LAYER OF SAID WATER-SOLUBLE POLYMER BETWEEN THE OBJECT AND THE WATER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |