Patent US3540529A successfully refreshed from Google Patents.
US3540529A
Expired / Lapsed
US
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Welded assembly of a tube and a tube sheet
Assignee: Hitachi Ltd
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Filing: 1968-02-14
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Granted: 1970-11-17
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Expires: 1988-02-14
Abstract
No abstract record available.
Inventors
- 👤 Tomotaka Umino
- 👤 Hisanao Kita
- 👤 Masahiro Kobayashi
- 👤 Toshiaki Horiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:12
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/028; B23K9/0288; B23K9/23; F; F16; F16L; F16L41/00; F16L41/08; F16L41/082; F16L41/084; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
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) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |