Patent US2771669A successfully refreshed from Google Patents.
US2771669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating interior of tubing with zinc
Assignee: Motors Liquidation Co
•
Filing: 1952-07-07
•
Granted: 1956-11-27
•
Expires: 1972-07-07
Abstract
No abstract record available.
Inventors
- 👤 John W Armstrong
- 👤 Richard W Spears
- 👤 Richard D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:19
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/04; C23C14/046; B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/939; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49828; Y10T29/49888; Y10T29/4998; Y10T29/49982; Y10T29/49986; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799; Y10T428/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN THE MANUFACTURE OF STEEL TUBING WHICH IS FORMED CONTINUOUSLY FROM A FLAT STEEL STRIP BY BENDING THE STRIP INTO TUBULAR FORM AND WELDING THE ABUTTING EDGES OF THE TUBE AS IT IS CONTINUOUSLY MOVED PAST A WELDING DEVICE; THE METHOD OF COATING THE INTERIOR SURFACE OF THE TUBING DURING ITS CONTINUOUS FORMATION AND WHILE IT IS BEING MOVED CONTINUOUSLY WITH A NON-CORROSIVE METAL SUCH AS ZINC WHICH COMPRISES THE STEPS OF INTRODUCING PARTICLES OF SAID METAL INTO THE TUBING BEFORE THE TUBING IS FULLY FORMED AND WHILE IT IS BELOW WELDING TEMPERATURE, INTRODUCING A NON-OXIDIZING GAS INTO THE TUBE AFTER IT IS FULLY FORMED AND WELDED, SUBSEQUENTLY HEATING THE TUBE SUFFICIENTLY TO VAPORIZE THE COATING METAL, AND THEREAFTER COOLING THE TUBING TO EFFECT CONDENSATION OF THE VAPORIZED METAL ON THE SURFACE OF THE TUBING
Claim 2
Dependent Claim
135 words
IN THE MANUFACTURE OF STEEL TUBING WHICH IS FORMED CONTINUOUSLY FROM A FLAT STEEL STRIP BY BENDING THE STRIP INTO TUBULAR FORM AND WELDING THE ABUTTING EDGES OF THE TUBE AS IT IS CONTINUOUSLY MOVED PAST A WELDING DEVICE; THE METHOD OF COATING THE INTERIOR SURFACE OF THE TUBING DURING ITS CONTINUOUS FORMATION AND WHILE IT IS BEING MOVED CONTINUOUSLY WITH A NON-CORROSIVE METAL SUCH AS ZINC WHICH COMPRISES THE STEPS OF INTRODUCING PARTICLES OF SAID METAL INTO THE TUBING BEFORE THE TUBING IS FULLY FORMED AND WHILE IT IS BELOW WELDING TEMPERATURE, INTRODUCING A NON-OXIDIZING GAS INTO THE TUBE AFTER IT IS FULLY FORMED AND WELDED, SUBSEQUENTLY HEATING THE TUBE SUFFICIENTLY TO VAPORIZE THE COATING METAL, AND THEREAFTER COOLING THE TUBING TO EFFECT CONDENSATION OF THE VAPORIZED METAL ON THE SURFACE OF THE TUBING
References Cited (Backward Citations)
GB124283A
Cited
US1506971A
Cited
US1818008A
Cited
GB363954A
Cited
US1892607A
Cited
FR795238A
Cited
US2126556A
Cited
US2206064A
Cited
GB552126A
Cited
GB572703A
Cited
US2442485A
Cited
US2559878A
Cited
US2657457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |