US3729346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure spray process for phosphating iron or steel surfaces
Assignee: Gerhard Collardin GmbH
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Filing: 1971-05-21
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Granted: 1973-04-24
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Expires: 1991-05-21
Abstract
Abstract A PROCESS FOR APPLYING RUST-PREVENTING PHOSPHATE COATINGS TO SURFACES OF OBJECTS MADE OF IRON OR STEEL BY SPRAYING SAID OBJECTS WITH AN ACID SOLUTION OF PHOSPHATES OF LAYER-FORMING METALS UNDER A SPRAY PRESSURE OF 10 TO 100 ATMOSPHERES GAUGE.
Inventors
- 👤 H Gotta
- 👤 N Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:07
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/76
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |