Patent US3271552A successfully refreshed from Google Patents.
US3271552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave heating apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1963-02-01
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Granted: 1966-09-06
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Expires: 1983-02-01
Abstract
No abstract record available.
Inventors
- 👤 Edward Z Krajewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:46
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6491; H05B6/6494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
IN A MICROWAVE HEATING APPARATUS, A CONDUCTIVELY BOUNDED CHAMBER, A PLURALITY OF SUBSTANTIALLY QUARTER WAVE LENGTH CONDUCTING ELEMENTS MOUNTED IN THE WALL OF AND EXTENDING INTO SAID CHAMBER, AND MEANS FOR SUPPORTING FOOD TO BE HEATED BETWEEN SAID ELEMENTS AND SPACED FROM SAID WALL.
Claim 2
Dependent Claim
44 words
IN A MICROWAVE HEATING APPARATUS, A CONDUCTIVELY BOUNDED CHAMBER, A PLURALITY OF SUBSTANTIALLY QUARTER WAVE LENGTH CONDUCTING ELEMENTS MOUNTED IN THE WALL OF AND EXTENDING INTO SAID CHAMBER, AND MEANS FOR SUPPORTING FOOD TO BE HEATED BETWEEN SAID ELEMENTS AND SPACED FROM SAID WALL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |