US3630914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous glycol-based automotive antifreeze coolant and concentrate containing antileak additive
Assignee: Dow Chemical Co
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Filing: 1969-07-03
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Granted: 1971-12-28
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Expires: 1989-07-03
Abstract
Abstract SMALL LEAKS IN AQUEOUS SYSTEMS, E.G., AUTOMOBILE RADIATORS, ARE STOPPED BY THE ADDITION TO THE AQUEOUS FLUID OF ABOUT 10 TO 1000 P.P.M. OF PARTICULATE CROSS-LINKED POLYARCYLAMIDE, WHEREIN THE POLYACYLAMIDE, PARTICLES, IN DRY FORM, ARE PREDOMINANTLY OF SIZE THAT PASSES A 50 MESH SCREEN BUT NOT A 200 MESH SCREEN.
Inventors
- 👤 Robert J Nankee
- 👤 Conrad D Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:47
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |