US2756804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube corrugating apparatus
Assignee: Flexonics Corp
•
Filing: 1950-10-21
•
Granted: 1956-07-31
•
Expires: 1970-10-21
Abstract
No abstract record available.
Inventors
- 👤 Frank S Schindler
- 👤 Bransford R Homfeldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:09
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; B21D15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US349718A
Cited
US605195A
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US1308833A
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GB189607299A
Cited
US2083763A
Cited
GB333104A
Cited
US1946472A
Cited
US2306018A
Cited
US2541869A
Cited
US2423862A
Cited
US2581787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |