Patent US2828533A successfully refreshed from Google Patents.
US2828533A
Expired / Lapsed
US
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Method of making integral sheet and tubing products
Assignee: Individual
•
Filing: 1956-12-19
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Granted: 1958-04-01
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Expires: 1976-12-19
Abstract
No abstract record available.
Inventors
- 👤 Howard A Fromson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; B21D53/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1938633A
Cited
US2147407A
Cited
US2212481A
Cited
US2252012A
Cited
US2375334A
Cited
US2420715A
Cited
US2766514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |