Patent US3537935A successfully refreshed from Google Patents.
US3537935A
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US
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Apparatus for manufacturing a heat exchanger component formed with flexible plastic tubes
Assignee: Ametek Inc
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Filing: 1968-08-06
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Granted: 1970-11-03
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Expires: 1988-08-06
Abstract
No abstract record available.
Inventors
- 👤 Michael Somerville Withers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:20
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/26; B21; B21D; B21D53/00; B21D53/02; F; F28; F28D; F28D7/00; F28D7/0008; F28D7/0025; F28F; F28F21/00; F28F21/06; F28F21/062; F28F9/00; F28F9/007; F28F9/013; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49364
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |