Rotary Valve Patents by Aspin and others 1930-2001

Patents exist in Germany, France, Holland, Spain, Japan, and are all duplicates of those below
Patents are freely available from http://ep.espacenet.com and http://www.uspto.gov
Patent registers are available in public reference libraries (microfiche)
As far as I am aware, this list is complete
YearPatent NumberAuthorFiledownloadSize Kb
19110983328Vallilleedownload 385
19141098679Muellerdownload 1702
19151159482Englishdownload 501
19200136344Musuresdownload 125
19210138919Doutredownload 333
19210145783Echarddownload 291
19210146116Idedownload 384
19210158269Dennisondownload 387
19210168941Francisdownload 342
19210171822Stonerdownload 555
192201427726Echarddownload 286
19220151994Tebaldidownload 423
19220173877Acherdownload 231
19220187068Simpsondownload 632
19230206196Whitedownload 889
19240216841Bournonvilledownload 527
19250243583Wehrdownload 470
19251539041Crawforddownload 348
19260246687Crossdownload 489
19260259400Crossdownload 297
19260268937Peaceydownload 901
19270278566Porterdownload 288
19280275557Luyckxdownload 378
19280295537Baerdownload 508
19300337345Edwardsdownload 423
19300355268Addisondownload 681
19310358802Zeemandownload 506
19320373660Crossdownload 503
19330393130Haslerdownload 240
19340408756Crossdownload 257
19340411010Crossdownload 254
19350423474Crossdownload 960
19350436117Crossdownload 338
19350448368Crossdownload 344
19360448383Crossdownload 257
19360448384Crossdownload 274
19360451917Crossdownload 394
19362283594Aspindownload 161
19370463412Aspindownload 1191
19370467620Crossdownload 415
19370474521Crossdownload 287
19380479539Crossdownload 747
19380481933Crossdownload 255
19380486594Browndownload 504
19390506967NSUdownload 264
19390511208Aspindownload 864
19392245743Aspindownload 133
19400523887BMWdownload 89
19402296081Aspindownload 64
19410535856Aspindownload 674
19410537863Aspindownload 568
19420545669Aspindownload 294
19430555639Aspindownload 567
19430556740Aspindownload 496
19430557564Aspindownload 428
19430557565Aspindownload 407
19430570354Aspindownload 378
19432378120Aspindownload 45
19432387971Aspindownload 32
19432387972Aspindownload 89
19440559710Aspindownload 339
19440560086Aspindownload 388
19440560469Aspindownload 357
19440562549Aspindownload 537
19440562933Aspindownload 355
19440564850Aspindownload 793
19440566180Aspindownload 472
19440566305Aspindownload 526
19440566416Boorerdownload 1109
19442381711Aspindownload 64
19442407127Aspindownload 96
19442429304Aspindownload 72
19442526450Aspindownload 66
19442557777Aspindownload 347
19450570286Aspindownload 382
19450570354Aspindownload 378
19450573685Aspindownload 350
19460608723Crossdownload 294
19470593035Aspindownload 421
19490632128Boorerdownload 905
19500635339Aspindownload 315
19500637362Aspindownload 339
19512725043Bacotdownload 385
19520683814DMWdownload 469
19530691181Aspindownload 437
19550735332Boorerdownload 260
19550738085NSUdownload 381
19572926639Aspindownload 28
19572926640Aspindownload 193
19610859366Aspindownload 277
19610864453Aspindownload 703
19610872216Aspindownload 814
19673526215Aspindownload 643
19701234663Henvauxdownload 473
19711228156Aspindownload 740
19711234663Henvauxdownload 471
19711241191Blairdownload 395
19741479347TRAdownload 820
19741516092Aspindownload 795
19751496283Danadownload 1490
19751516809Danadownload 765
19761516809Danadownload 765
19761556769Danadownload 678
19771478488BLdownload 313
19774033317Aspindownload 430
19781600713Altodownload 827
19791540557Gentiledownload 511
19791548825Alsodownload 1061
19792028920Hopkinsdownload 366
19802028920Hopkinsdownload 366
19802072258Balldownload 331
19802088472Hasselldownload 280
19812072258Balldownload 331
19824311119Menziesdownload 529
19832112060Pearsondownload 404
19832114219Ablettdownload 425
19832114654Baileydownload 265
19832125890Ablettdownload 165
19842129488Milnerdownload 847
19862166493Brodiedownload 214
19872182389Hondadownload 707
19872190139Leitchdownload 146
19872191537Prokopiusdownload 196
19882195395Hansendownload 1634
19882203192Forddownload 369
19882203797AEplcdownload 434
19892206379Mottershawdownload 323
19892211549Keendownload 554
19900423444Coatesdownload 1120
19912234300Frenchdownload 333
19932281350Marshalldownload 998
19962293210Nichollsdownload 358
19982317417Maillierdownload 426
19992332022Sleedownload 596
19992335463Falkousdownload 281
19992362925BSAdownload 604
20012362925BSAdownload 53