Patent US3521332A successfully refreshed from Google Patents.
US3521332A
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Assignee: ROY G KRAMER
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Filing: 1968-03-04
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Granted: 1970-07-21
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Expires: 1988-03-04
Abstract
No abstract record available.
Inventors
- 👤 Roy G Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:52
CPC Classifications
F; F16; F16L; F16L3/00; F16L3/22; F16L3/237; F16B; F16B2/00; F16B2/20; F16B2/22; F16B5/00; F16B5/06; F16B5/0685; F16B7/00; F16B7/04; F16B7/0433; F16L3/08; F16L3/12; F16L3/13; H; H02; H02G; H02G3/00; H02G3/30; H02G3/32; Y; Y10; Y10S; Y10S248/00; Y10S248/911; Y10S248/912; Y10T; Y10T403/00; Y10T403/46
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) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |