US2515934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate coating of metal articles
Assignee: Du-Lite Chemical Corp
•
Filing: 1947-12-17
•
Granted: 1950-07-18
•
Expires: 1967-12-17
Abstract
No abstract record available.
Inventors
- 👤 Verner Harry Grey
- 👤 Lindley S Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:53
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/02; C23C22/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A PHOSPHATIZING LIQUID FOR PHOSPHATE COATING ARTICLES MADE OF METAL OF THE CLASS CAPABLE OF REACTING WITH PHOSPHORIC ACID TO FORM A METAL PHOSPHATE, CONSISTING ESSENTIALLY OF FROM ONE TO SEVEN PERCENT OF CONCENTRATED PHOSPHORIC ACID DISSOLVED IN AN ORGANIC SOLVENT THEREFOR, SAID ORGANIC SOLVENT BEING CAPABLE OF BEING EVAPORATED AT A MODERATE TEMPERATURE, AND SAID PHOSPHATIZING LIQUID HAVING NO AQUEOUS PHASE AND CONTAINING ONLY A SMALL PROPORTION OF WATER BASED ON ITS PHOSPHORIC ACID CONTENT.
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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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |