US2517430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making bearings
Assignee: Duracell Inc USA
•
Filing: 1945-12-11
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Granted: 1950-08-01
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Expires: 1965-12-11
Abstract
No abstract record available.
Inventors
- 👤 Franz R Hensel
- 👤 Julian G Sparkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/24; C; C23; C23F; C23F1/00; F16C33/06; F16C33/14; F16C2220/00; F16C2220/40; F16C2220/44; F16C2220/80; F16C2220/82; F16C2220/84; F16C2223/00; F16C2223/10; F16C2223/30; F16C2223/40; F16C2223/44; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49647; Y10T29/49668; Y10T29/49677; Y10T29/49702; Y10T428/00; Y10T428/12; Y10T428/12361; Y10T428/12486; Y10T428/12493; Y10T428/12701; Y10T428/12708; Y10T428/12771; Y10T428/12778
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD OF MAKING GRID BEARINGS WHICH COMPRISES PROVIDING A SELF-SUSTAINING MASKING LAYER OF A MATERIAL RESISTANT TO A CHEMICAL ETCHING AGENT AND HAVING A LARGE NUMBER OF APERTURES THEREIN, PLACING SAID LAYER IN DIRECT CONTACT WITH THE SURFACE OF A BEARING METAL TO EXPOSE ISOLATED AREAS THEREOF AND TO MASK THE REMAINING AREAS THEREOF, ETCHING THE STRUCTURE THUS FORMED WITH A CHEMICAL AGENT TO ETCH RECESSES IN THE SAID EXPOSED AREAS, REMOVING THE MASKING LAYER, AND FILLING THE SAID RECESSES WITH A LUBRICATING METAL.
Claim 2
Independent Claim
85 words
THE METHOD OF MAKING GRID BEARINGS WHICH COMPRISES PROVIDING A SELF-SUSTAINING MASKING LAYER OF A MATERIAL RESISTANT TO A CHEMICAL ETCHING AGENT AND HAVING A LARGE NUMBER OF APERTURES THEREIN, PLACING SAID LAYER IN DIRECT CONTACT WITH THE SURFACE OF A BEARING METAL TO EXPOSE ISOLATED AREAS THEREOF AND TO MASK THE REMAINING AREAS THEREOF, ETCHING THE STRUCTURE THUS FORMED WITH A CHEMICAL AGENT TO ETCH RECESSES IN THE SAID EXPOSED AREAS, REMOVING THE MASKING LAYER, AND FILLING THE SAID RECESSES WITH A LUBRICATING METAL.
References Cited (Backward Citations)
US1581394A
Cited
US1637317A
Cited
US2052962A
Cited
US2166366A
Cited
US2329483A
Cited
GB536414A
Cited
US2341293A
Cited
GB547619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |