US3278324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant metal members
Assignee: AO Smith Corp
•
Filing: 1962-12-24
•
Granted: 1966-10-11
•
Expires: 1982-12-24
Abstract
No abstract record available.
Inventors
- 👤 Forrest W Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:43
CPC Classifications
C; C23; C23D; C23D5/00; C23D5/005; C23D5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A METHOD OF APPLYING A GLASS COATING TO THE INTERNAL SURFACE OF A TUBULAR MEMBER, THE STEPS OF MIXING FINELY DIVIDED PARTICLES OF A REFRACTORY MATERIAL WITH A GLASS GROUND COAT FRIT IN AN AMOUNT OF 25 TO 75% BY WEIGHT OF SAID FRIT TO PROVIDE A GROUND COAT COMPOSITION, APPLYING SAID GROUND COAT COMPOSITION TO THE INTERNAL SURFACE OF THE TUBULAR MEMBER, HEATING THE MEMBER TO A TEMPERATURE SUFFICIENTLY HIGH TO FIRE SAID FRIT AND BELOW THE MELTING POINT OF SAID REFRACTORY MATERIAL, INTRODUCING AN ELONGATED APPLICATOR INTO SAID TUBULAR MEMBER SUPPORTING AT LEAST A PORTION OF THE APPLICATOR ON THE GROUND COAT, DISCHARGING A GLASS COVER COAT FRIT FROM SAID APPLICATOR ON THE GROUND COAT, AND FIRING THE COVER COAT FRIT TO PROVIDE A SMOOTH CORROSION RESISTANT COATING ON THE INTERNAL SURFACE OF THE TUBULAR MEMBER.
Claim 2
Dependent Claim
139 words
IN A METHOD OF APPLYING A GLASS COATING TO THE INTERNAL SURFACE OF A TUBULAR MEMBER, THE STEPS OF MIXING FINELY DIVIDED PARTICLES OF A REFRACTORY MATERIAL WITH A GLASS GROUND COAT FRIT IN AN AMOUNT OF 25 TO 75% BY WEIGHT OF SAID FRIT TO PROVIDE A GROUND COAT COMPOSITION, APPLYING SAID GROUND COAT COMPOSITION TO THE INTERNAL SURFACE OF THE TUBULAR MEMBER, HEATING THE MEMBER TO A TEMPERATURE SUFFICIENTLY HIGH TO FIRE SAID FRIT AND BELOW THE MELTING POINT OF SAID REFRACTORY MATERIAL, INTRODUCING AN ELONGATED APPLICATOR INTO SAID TUBULAR MEMBER SUPPORTING AT LEAST A PORTION OF THE APPLICATOR ON THE GROUND COAT, DISCHARGING A GLASS COVER COAT FRIT FROM SAID APPLICATOR ON THE GROUND COAT, AND FIRING THE COVER COAT FRIT TO PROVIDE A SMOOTH CORROSION RESISTANT COATING ON THE INTERNAL SURFACE OF THE TUBULAR MEMBER.
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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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |