US3412448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for manufacturing sheet metal central heating radiators
Assignee: Polyventions Ltd
•
Filing: 1965-11-19
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Granted: 1968-11-26
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Expires: 1985-11-19
Abstract
No abstract record available.
Inventors
- 👤 Landberg Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:20
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0308; F28D21/00; F28D2021/0019; F28D2021/0035; Y; Y02; Y02B; Y02B30/00; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49393; Y10T29/49789; Y10T29/49798; Y10T29/51; Y10T29/5136; Y10T29/5137; Y10T29/5143; Y10T29/5145; Y10T29/5191; Y10T29/5197; Y10T29/5198; Y10T29/53; Y10T29/53113; Y10T29/53122; Y10T83/00; Y10T83/04; Y10T83/0524; Y10T83/0572; Y10T83/444; Y10T83/4577
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |