US3021887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium stretch forming
Assignee: Rohr Inc
•
Filing: 1956-07-19
•
Granted: 1962-02-20
•
Expires: 1976-07-19
Abstract
No abstract record available.
Inventors
- 👤 Kermit W Maynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:41
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49799; Y10T29/4981
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
THE METHOD OF BENDING A LONG THIN SHEET OF TITANIUM TO THE SHAPE OF A CURVED DIE FACE WHICH COMPRISES THE STEPS OF RESISTANCE BRAZING THE INNER ENDS OF THIN SHORT STAINLESS STEEL SHEETS TO THE OPPOSITE ENDS OF SAID SHEETS BY INTERPOSING STRIPS OF BRAZING ALLOY IN FACE ADJACENCY RESPECTIVELY BETWEEN SAID TITANIUM SHEET AND EACH OF SAID STAINLESS STEEL SHEETS, PRESSING EACH OF SAID STRIPS BETWEEN THE TITANIUM SHEET AND THE STAINLESS STEEL STEELADJACENT THERETO AND CONCURRENTLY PASSING ELECTRICAL CURRENT THERETHROUGH AND PROGRESSIVELY ALONG A LINE ACROSS SAID SHEETS WITH INTENSITY AND LIMITED DURATION SUFFICIENT TO HEAT EACH OF SAID STRIPS ALONG SAIDLINE TO BRAZING TEMPEATURE AT THE MELTING TEMPERATURE OF SAID ALLOY; HEATING SAID DIE FACE TO A TEMPERATURE WITHIN THE RANGE OF 400* TO 800*F.; PLACING THE CENTER PORTION OF SAID LONG
Claim 2
Independent Claim
136 words
THE METHOD OF BENDING A LONG THIN SHEET OF TITANIUM TO THE SHAPE OF A CURVED DIE FACE WHICH COMPRISES THE STEPS OF RESISTANCE BRAZING THE INNER ENDS OF THIN SHORT STAINLESS STEEL SHEETS TO THE OPPOSITE ENDS OF SAID SHEETS BY INTERPOSING STRIPS OF BRAZING ALLOY IN FACE ADJACENCY RESPECTIVELY BETWEEN SAID TITANIUM SHEET AND EACH OF SAID STAINLESS STEEL SHEETS, PRESSING EACH OF SAID STRIPS BETWEEN THE TITANIUM SHEET AND THE STAINLESS STEEL STEELADJACENT THERETO AND CONCURRENTLY PASSING ELECTRICAL CURRENT THERETHROUGH AND PROGRESSIVELY ALONG A LINE ACROSS SAID SHEETS WITH INTENSITY AND LIMITED DURATION SUFFICIENT TO HEAT EACH OF SAID STRIPS ALONG SAIDLINE TO BRAZING TEMPEATURE AT THE MELTING TEMPERATURE OF SAID ALLOY; HEATING SAID DIE FACE TO A TEMPERATURE WITHIN THE RANGE OF 400* TO 800*F.; PLACING THE CENTER PORTION OF SAID LONG
References Cited (Backward Citations)
US661615A
Cited
US853862A
Cited
US1724323A
Cited
US2006468A
Cited
US2161430A
Cited
US2279965A
Cited
US2464169A
Cited
US2752982A
Cited
US2759513A
Cited
US2768271A
Cited
US2798843A
Cited
US2808501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |