Patent US4899270A successfully refreshed from Google Patents.
Patent US2157978A successfully refreshed from Google Patents.
US2157978A
Expired / Lapsed
US
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Method of making tank heads and closure members therefor
Assignee: Individual
•
Filing: 1936-04-20
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Granted: 1939-05-09
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Expires: 1956-04-20
Abstract
No abstract record available.
Inventors
- 👤 Giles E Bullock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:54
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/40; B21D28/00; B21D28/02; B21D28/06; F; F16; F16J; F16J13/00; F16J13/02; F16J13/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49796
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-05-08 | 1942-11-07 | 1943-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-08 | 1946-11-07 | 1947-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-08 | 1950-11-07 | 1951-05-09 | $7700.00 | Window Closed / Lapsed |