US2748037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating articles requiring annealing
Assignee: Rohr Inc
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Filing: 1951-03-23
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Granted: 1956-05-29
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Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Burnham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:27
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/086; C21; C21D; C21D1/00; C21D1/68; C21D1/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE METHOD OF ANNEALING PRODUCING A SMOOTH SURFACE OF SUBSTANTIALLY UNIFORM TEXTURE AND HAVING THE NATURAL COLOR OF THE ALLOY ON A PLURALITY OF SIMILAR STAINLESS STEEL ARTICLES FORMED TO A CURVED SHAPE AND HAVING INTERNAL STRESSES DUE TO THE FORMING, COMPRISING THE STEPS OF WETTING THE ENTIRE ARTICLES SIMULTANEOUSLY WITH AN AQUEOUS SOLUTION OF A SURFACE TENSION-REDUCING AGENT AND A SALT OF THE GROUP CONSISTING OF SODIUM NITRATE, SODIUM CARBONATE AND TRISODIUM PHOSPHATE TO FORM A COATING ON THE ARTICLES; SUPPORTING THE ARTICLES IN SPACED APART POSITIONS IN A REDUCING ATMOSPHERE SO THAT THE ENTIRE COATED SURFACES OF THE ARTICLES ARE EXPOSED TO THE REDUCING ATMOSPHERE AND SIMULTANEOUSLY HEATING THE COATED ARTICLES TO AN ANNEALING TEMPERATURE; COOLING THE ANNEALED ARTICLES SIMULTANEOUSLY; IMMERSING THE ARTICLES SIMULTANEOUSLY IN A HOT AQUEOUS SOLUTION OF FERRIC SULPHATE AND HYDROFLUORIC ACID TO DISSOLVE THE SCALE ON THE ARTICLES; AND WASHING THE ARTICLES TO REMOVE THE DISSOLVED SCALE.
Claim 2
Independent Claim
153 words
THE METHOD OF ANNEALING PRODUCING A SMOOTH SURFACE OF SUBSTANTIALLY UNIFORM TEXTURE AND HAVING THE NATURAL COLOR OF THE ALLOY ON A PLURALITY OF SIMILAR STAINLESS STEEL ARTICLES FORMED TO A CURVED SHAPE AND HAVING INTERNAL STRESSES DUE TO THE FORMING, COMPRISING THE STEPS OF WETTING THE ENTIRE ARTICLES SIMULTANEOUSLY WITH AN AQUEOUS SOLUTION OF A SURFACE TENSION-REDUCING AGENT AND A SALT OF THE GROUP CONSISTING OF SODIUM NITRATE, SODIUM CARBONATE AND TRISODIUM PHOSPHATE TO FORM A COATING ON THE ARTICLES; SUPPORTING THE ARTICLES IN SPACED APART POSITIONS IN A REDUCING ATMOSPHERE SO THAT THE ENTIRE COATED SURFACES OF THE ARTICLES ARE EXPOSED TO THE REDUCING ATMOSPHERE AND SIMULTANEOUSLY HEATING THE COATED ARTICLES TO AN ANNEALING TEMPERATURE; COOLING THE ANNEALED ARTICLES SIMULTANEOUSLY; IMMERSING THE ARTICLES SIMULTANEOUSLY IN A HOT AQUEOUS SOLUTION OF FERRIC SULPHATE AND HYDROFLUORIC ACID TO DISSOLVE THE SCALE ON THE ARTICLES; AND WASHING THE ARTICLES TO REMOVE THE DISSOLVED SCALE.
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) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |