US3405251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum evaporation source
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1966-05-31
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Granted: 1968-10-08
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Expires: 1986-05-31
Abstract
No abstract record available.
Inventors
- 👤 Reuben S Spriggs
- 👤 Arthur J Learn
- 👤 Marinoff Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:16
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/243
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A VACUUM EVAPORATION SOURCE, COMPRISING: A BLOCK OF THERMALLY CONDUCTING MATERIAL PROVIDED WITH A MULTIPLICITY OF UNIFORMLY SPACED CYLINDRICAL CAVITIES EXTENDING FROM A SURFACE OF THE BLOCK TO A DEPTH LESS THAN THE THICKNESS THEREOF; THE MINIMUM WALL THICKNESS OF SAID BLOCK MATERIAL BETWEEN ADJACENT CAVITIES BEING AT LEAST 1/5 THE DEPTH OF SAID CAVITIES; THE VOLUME OF CAVITIES PER UNIT SURFACE AREA OF THE BLOCK ENCOMPASSING THE CAVITIES BEING NO LESS THAN .005 CUBIC INCH PER SQUARE INCH; AND THE DIAMETER OF EACH CAVITY BEING NO GREATER THAN 1/4 INCH.
Claim 2
Dependent Claim
91 words
A VACUUM EVAPORATION SOURCE, COMPRISING: A BLOCK OF THERMALLY CONDUCTING MATERIAL PROVIDED WITH A MULTIPLICITY OF UNIFORMLY SPACED CYLINDRICAL CAVITIES EXTENDING FROM A SURFACE OF THE BLOCK TO A DEPTH LESS THAN THE THICKNESS THEREOF; THE MINIMUM WALL THICKNESS OF SAID BLOCK MATERIAL BETWEEN ADJACENT CAVITIES BEING AT LEAST 1/5 THE DEPTH OF SAID CAVITIES; THE VOLUME OF CAVITIES PER UNIT SURFACE AREA OF THE BLOCK ENCOMPASSING THE CAVITIES BEING NO LESS THAN .005 CUBIC INCH PER SQUARE INCH; AND THE DIAMETER OF EACH CAVITY BEING NO GREATER THAN 1/4 INCH.
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |